Read the story.
Each pack of Triple Square Taffy has 3 pieces of fruit-flavored taffy. Pedro's favorite flavor
is strawberry, but there's only a 25% chance that each piece will be that flavor. He buys a
pack of Triple Square Taffy at the convenience store. How likely is it that all of the taffy
pieces are strawberry?
Which simulation could be used to fairly represent the situation?
Use a computer to randomly generate 4 numbers from 1 to 3. Each time 1
appears, it represents a strawberry taffy.
Flip a pair of coins 3 times. Each time the coins both land on heads, it
represents a strawberry taffy.
Create a deck of 25 cards, each labeled with a different number from 1 to 25.
Pick a card, then return it to the deck, 3 times. Each time a multiple of 5
appears, it represents a strawberry taffy.
PLEASE HELP 50 points
The simulation that could be used to fairly represent the situation is A. Use a computer to randomly generate 4 numbers from 1 to 3. Each time 1 appears, it represents a strawberry taffy.
How to explain the simulationThe probability of each taffy being strawberry is 0.25, so the probability of all 3 taffies being strawberry is:
0.25 * 0.25 * 0.25 = 0.015625 or approximately 1.56%
Therefore, the likelihood of all taffies being strawberry is very low.
The simulation that could be used to fairly represent the situation is to use a computer to randomly generate 4 numbers from 1 to 3. Each time 1 appears, it represents a strawberry taffy. This simulates the probability of each taffy being strawberry being 0.25 or 25%.
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Interpret the estimated coefficient for the total loans and leases to total assets ratio in terms of the odds of being financially weak. That is, holding total expenses/assets ratio constant then a one unit increase in total loans and leases-to-assets is associated with an increase in the odds of being financially weak by a factor of 14.18755183 +79.963941181 TotExp/Assets + 9.1732146 TotLns&Lses/Assets Interpret the estimated coefficient for the total loans and leases to total assets ratio in terms of the probability of being financially weak. That is, holding total expenses/assets ratio constant thena one unit increase in total loans and leases-to-assets is associated with an increase in the probability of being financially weak by a factor of __
The estimated coefficient for the total loans and leases to total assets ratio in terms of the probability of being financially weak is e^9.1732146 = 9866.15. Holding the total expenses/assets ratio constant, a one-unit increase in total loans and leases-to-assets is associated with an increase in the probability of being financially weak by a factor of 9866.15.
In logistic regression, the odds ratio represents the change in the odds of the outcome for a one-unit increase in the predictor variable, holding all other variables constant. To interpret the odds ratio in terms of probability, we can convert the odds ratio to a probability ratio by taking the exponential of coefficient.
In this case, the estimated coefficient for total loans and leases to total assets ratio is 9.1732146, which means that a one-unit increase in this ratio is associated with an increase in the odds of being financially weak by a factor of e^9.1732146 = 9866.15.
This means that the probability of being financially weak increases by approximately 9866 times for a one-unit increase in the total loans and leases to total assets ratio, holding the total expenses/assets ratio constant.
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Need help asap! thanks!
It is a rectangle because the opposite sides were parallel and congruent
Given data,
Let the quadrilateral be represented as WXYZ
Now , the line WX is parallel and congruent to the side YZ
So, they have the same slope
And , the line segment WZ is parallel and congruent to the side XY
So , they have the same slope
Therefore , the quadrilateral is a rectangle
Hence , the figure is a rectangle and the opposite sides have same slope
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what does the cli option on the model statement of an mlr analysis in proc glm do? question 1select one: a. produce prediction intervals for the slope parameters. b. produce confidence intervals for the mean response at all predictor combinations in the dataset. c. produce confidence intervals for the slope parameters. d. produce prediction intervals for a future response at all predictor combinations in the dataset.
The CLI option on the MODEL statement of an MLR analysis in PROC GLM produces confidence intervals for the mean response at all predictor combinations in the dataset. b
The CLI option stands for "Confidence Level of Intervals," and it specifies the level of confidence for the confidence intervals produced.
By default, the CLI option is set to 0.95, which means that the confidence intervals produced will have a 95% level of confidence.
These confidence intervals provide a range of values within which the true mean response at a particular combination of predictor values is expected to fall with a specified level of confidence.
They can be useful for assessing the uncertainty associated with the estimated mean response at different combinations of predictor values and for making inferences about the relationships between predictors and the response variable.
The CLI option, which stands for "Confidence Level of Intervals," defines the degree of confidence in the confidence intervals that are generated.
The CLI option's default value of 0.95 designates a 95% degree of confidence for the confidence intervals that are generated.
With a given degree of confidence, these confidence intervals show the range of values within which the real mean response for a specific set of predictor values is anticipated to fall.
They can be helpful for determining the degree of uncertainty surrounding the predicted mean response for various combinations of predictor values and for drawing conclusions on the connections between predictors and the response variable.
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True or False. When working with big data, a sample size is significantly large if the variability virtually disappears.
A. True
B. False
The answer is A. True. When working with big data, the sample size is so large that the variability in the data almost completely disappears.
What is variability?Variability is the degree of difference between values in a set of data. It is a measure of how spread out the values are from the mean or average of the set.
When dealing with smaller datasets, there is typically more variability. This is because a smaller sample size does not represent the entire population of data, and therefore does not provide an accurate representation of the underlying population of data. This variability can make it more difficult to draw valid conclusions from the data.
However, when working with a large sample size, the variability virtually disappears. This is because the data is spread across so many data points that the differences between individual data points become negligible. The result is that the data becomes more consistent and easier to analyze.
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You pick a card at random. 3 4 5 6 What is P(divisor of 50)? Write your answer as a percentage.
Malik buys 2 oranges and 5 mangoes at a cost of $4.50 while his friend Seb buys 4 oranges and 3 mangoes at a cost of $4.10. What is the cost of each item? (All of the oranges cost the same and all of the mangoes cost the same)
Answer:
$0.70
Step-by-step explanation:
Let the cost of an orange be represented by o and the cost of a mango be represented by m.
According to the problem, we can set up the following system of equations:
2o + 5m = 4.5
4o + 3m = 4.1
We can solve for o and m using elimination or substitution. Here's one way to solve it using elimination:
Multiply the first equation by 4 and the second equation by -2 to eliminate o:
8o + 20m = 18
-8o - 6m = -8.2
14m = 9.8
m = 0.7
Substitute m = 0.7 into one of the equations to solve for o:
2o + 5(0.7) = 4.5
2o + 3.5 = 4.5
2o = 1
o = 0.5
Therefore, the cost of an orange is $0.50 and the cost of a mango is $0.70.
Hope this helps!
a discrete random variable cannot be treated as continuous even when it has a large range of values
A discrete random variable cannot be treated as continuous even when it has a large range of values because they represent distinct, separate values rather than an unbroken range.
Discrete variables are typically expressed as whole numbers, while continuous variables can take on any value within a specified interval.Treating a discrete variable as continuous may lead to inaccuracies and misinterpretation of data. A discrete random variable is characterized by a finite or countably infinite set of possible values, whereas a continuous random variable can take on any value within a given range. Thus, even if a discrete random variable has a large range of values, it cannot be treated as continuous because it can only assume a limited number of specific values.
For example, the number of heads obtained in 10 coin flips is a discrete random variable with possible values ranging from 0 to 10, but it cannot take on non-integer values such as 3.5. In contrast, the time it takes for a car to travel a certain distance is a continuous random variable that can take on any value within a certain range, including non-integer values. Therefore, it is important to distinguish between discrete and continuous random variables in statistical analysis and modeling.
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smoothing parameter (alpha) close to 1 gives more weight or influence to recent observations over the forecast. group of answer choices true false
The given statement, "smoothing parameter (alpha) close to 1 gives more weight or influence to recent observations over the forecast" is true.
The smoothing parameter (alpha) defines the weight or impact given to the most recent observation in the forecast when we apply a smoothing approach such as Simple Exponential Smoothing. If alpha is near to one, we are assigning greater weight or influence to the most recent observation, which makes the forecast more sensitive to changes in the data. In other words, an alpha value near one indicates that we are depending on current data to estimate future values.
If alpha is near zero, the forecast will be less sensitive to changes in the data and will depend more largely on previous observations. This is because we are giving equal weight or influence to all observations, regardless of when they occurred.
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PLS HELP SOLVE THIS PROBLEM!
Answer:
BC/CD = DE/EF
The slope of this line is 2/3. From B, go up two units to C, then right three units to D.
Polymeter is
a: when two different meters exist in music, at the same time.
b: the division of the steady beat into two equal halves.
c: only common in classical music styles.
d : a pattern of 3 beats in repetition.
Question 1 (Essay Worth 10 points)
(01. 02 MC)The number line shows the distance in meters of two jellyfish, A and B, from a predator located at point X:
A horizontal number line extends from negative 3 to positive 3. The point A is at negative 1. 5, the point 0 is labeled as X, and the point labeled B is at 0. 5.
Write an expression using subtraction to find the distance between the two jellyfish. (5 points)
Show your work and solve for the distance using additive inverses. (5 points)
An expression to find the distance between the two jellyfish is B - A.
The distance is 2.0 meters.
What is a number line?In Mathematics and Geometry, a number line simply refers to a type of graph with a graduated straight line which comprises both positive and negative numbers that are placed at equal intervals along its length.
This ultimately implies that, a number line primarily increases in numerical value towards the right from zero (0) and decreases in numerical value towards the left from zero (0).
Therefore, the required expression for the distance between the two jellyfish is given by;
Distance = B - A
Distance = 0.5 - (-1.5)
Distance = 0.5 + 1.5
Distance = 2.0 m.
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What is the probabilty
The probability that Lin gets another turn is 1/60
Here, Lin will get a turn if both the cube and card have the same number.
A cube is numbered as 1, 2, 3, 4, 5, and 6
And the deck of 10 cards numbered 1 through 10
We can observe that there are only 6 (1 to 6) numbers which can follow above condition.
So, the chances of getting 6 in dice equals to 1/6
and the chances of getting 6 in card equals 1/10
Thus, the chance of getting both at once would be,
1/6 × 1/10
= 1/60
Therefore, the required probability is 1/60
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THIS ONE IS HARD SO PLEASE HELP ITS RSM....
AWNSER FOR EACH ONE
Y>0
Y<0
Y=0
The value of x when y=0 from the given absolute value equation is,
⇒ x = -1.
Here, The graph for the absolute equation y=|x+2| - 1 is given.
Now, Rewrite in vertex form and use this form to find the vertex (h,k).
(-2, -1)
To find the x-intercept, substitute in 0 for y and solve for x.
To find the y-intercept, substitute in 0 for x and solve for y.
x-intercept(s): (-1,0),(-3,0)
y-intercept(s): (0, 1)
Here, y>0
So, 1 = |x+2|-1
2=x+2
x=0
When y<0
So, -1=|x+2|-1
x+2=0
x=-1
When y=0
0=|x+2|-1
1=x+2
x=-1
Therefore, the value of x when y=0 from the given absolute value equation is x=-1.
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(1) Let A and B be two sets in a metric space (M, d), and X = (xk) be a sequence in A ∪ B. Show that X has a subsequence X′ such that either X′ is in A or X′ is in B.
(2) Use (1) to show that the union of two sequentially compact sets in a metric space (M, d) is sequentially compact
(1) To show that X has a subsequence X' such that either X' is in A or X' is in B, we can use the fact that A and B are subsets of the metric space (M,d) to construct two subsequences, one consisting of terms from A and the other consisting of terms from B.
Let X_A be the subsequence of X that consists of all terms in A, and let X_B be the subsequence of X that consists of all terms in B. If either of these subsequences is infinite, then we are done. Otherwise, both A and B are finite sets, and we can construct a subsequence X' by interleaving the terms from X_A and X_B in any way we choose.
For example, suppose A = {a1, a2, a3} and B = {b1, b2}. Then X_A = (a1, a2, a3) and X_B = (b1, b2), and we can construct the subsequence X' = (a1, b1, a2, b2, a3). This subsequence has terms from both A and B, but we can easily extract a sub-subsequence consisting only of terms from A or only of terms from B if we wish.
(2) To show that the union of two sequentially compact sets in a metric space (M,d) is sequentially compact, we need to show that every sequence in the union has a convergent subsequence. Let A and B be two sequentially compact subsets of M, and let X be a sequence in A ∪ B. By (1), X has a subsequence X' that is either in A or in B.
If X' is in A, then it has a convergent subsequence by the sequential compactness of A. This subsequence is also a subsequence of X and therefore converges in A ∪ B. If X' is in B, then it has a convergent subsequence by the sequential compactness of B, and we can again argue that this subsequence converges in A ∪ B.
Therefore, every sequence in A ∪ B has a convergent subsequence, and so A ∪ B is sequentially compact.
(1) Since X = (xk) is a sequence in A ∪ B, each term xk is either in A or in B. Divide the terms of X into two subsequences: X_A consisting of terms in A, and X_B consisting of terms in B. At least one of these subsequences must be infinite (since a finite subsequence cannot exhaust the entire sequence X).
Without loss of generality, assume X_A is infinite. Then X_A is a subsequence of X consisting only of terms in A. Let X' = X_A. Then X' is a subsequence of X such that X' is in A. Similarly, if X_B were infinite, we could construct a subsequence X' in B.
(2) To show that the union of two sequentially compact sets in a metric space (M, d) is sequentially compact, we need to show that any sequence in the union has a convergent subsequence.
Let A and B be two sequentially compact sets in (M, d), and let X = (xk) be a sequence in A ∪ B. By part (1), we know that X has a subsequence X' such that either X' is in A or X' is in B. Without loss of generality, assume X' is in A.
Since A is sequentially compact, X' has a convergent subsequence X'' in A. Thus, X'' is a convergent subsequence of X in A ∪ B. Similarly, if X' were in B, we would have a convergent subsequence in B. Therefore, the union A ∪ B is sequentially compact.
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Sally recently started a new job at at a furniture store and makes
$10.25 per hour. Last week, Sally earned $110.39. Her boss told her
that the company is only able to pay her less than $200 for each
two-week period that she works.
Write an inequality to represent how many hours she can work this
week. Use x for the variable.
let c be the digits of π. that is, c0 =3,c1 =1,c2 =4, etc. show that the series [infinity] ∑k=0 k 10 k converges
The series [infinity] ∑k=0 k 10 k converges since the terms of the series approach zero as k increases, and the series satisfies the ratio test.
The ratio of successive terms is 10, which is less than 1, indicating that the series converges.
To show this using the digits of π, we can express the series as [infinity] ∑k=0 c k 10 k , where c k represents the kth digit of π. Since the digits of π are bounded and do not increase indefinitely, the terms of the series also approach zero.
Additionally, the ratio of successive terms can be expressed as c k+1 / c k 10, which is less than 1 for all k, indicating convergence. Therefore, the series [infinity] ∑k=0 k 10 k converges, both in general and when expressed using the digits of π.
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use two different paths to demonstrate that the lim(x,y)→(0,0) (x^2)/(x^2y^2 + (x-y)^2) does not exist
To demonstrate that the limit lim(x,y)→(0,0) [tex](x^2)/(x^2y^2 + (x-y)^2)[/tex] does not exist, we can use two different paths:
Path 1: Let y = x In this path, we substitute y with x in the expression: lim(x,x)→ [tex](0,0) (x^2)/(x^2x^2 + (x-x)^2)[/tex] = lim(x,x)→ [tex](0,0) (x^2)/(x^4)[/tex]As x approaches 0, the expression simplifies to: lim(x→0) [tex](x^2)/(x^4)[/tex] = lim(x→0) [tex]1/x^2[/tex] When x approaches 0, [tex]1/x^2[/tex] goes to infinity.
Therefore, the limit along this path does not exist.
Path 2: Let y = 0 In this path, we substitute y with 0 in the expression: lim(x,0)→(0,0)[tex](x^2)/(x^2(0)^2 + (x-0)^2)[/tex] = lim(x,0)→ [tex](0,0) (x^2)/(x^2)[/tex] As x approaches 0, the expression simplifies to: lim(x→0) (x^2)/(x^2) = lim(x→0) 1
When x approaches 0, the expression equals 1, which is a finite value.
Since the limits along Path 1 and Path 2 are not equal, we can conclude that the limit lim(x,y)→(0,0) [tex](x^2)/(x^2y^2 + (x-y)^2)[/tex] does not exist.
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Suppose that x and y vary inversely, and x=12 when y=5. Write the function that models the inverse variation.
The statement is expressed as:
[tex]y \alpha 1/x[/tex]
To convert to an equation introduce k, the constant of variation.
[tex]y=k * 1/x\\[/tex]
To find k use the condition that [tex]x = 12[/tex] when [tex]y = 5[/tex]
[tex]y=k/x[/tex]
[tex]5=k/12[/tex]
[tex]k=5*12[/tex]
[tex]k=60\\[/tex]
Therefore, [tex]y =60/x[/tex] is the function.
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Ms. Smith tells you that a righttriangle has a hypotenuse of 24 feet and a leg of 17 feet. She asks you to find the other leg of the triangle. Whatis your answer?
Answer: sqrt287
Step-by-step explanation:
sqrt(24^2-17^2)=sqrt287
(co 4) a company manufacturers soda cans with a diameter of 52 millimeters. in a sample of 18 cans, the standard deviation was 2.3 millimeters. what would be the 96onfidence interval for these cans?
The 96% confidence interval for the soda cans' diameters manufactured by CO 4 is approximately 51.1 mm to 52.9 mm.
To calculate the 96% confidence interval for the soda cans' diameters, we need to consider the sample mean, standard deviation, and sample size, as well as the appropriate Z-score for the desired level of confidence.
The terms you've provided are:
- Company (CO 4) - A company that manufactures soda cans.
- Diameter of 52 mm - The average diameter of the soda cans.
- Sample size of 18 - The number of soda cans in the sample.
- Standard deviation of 2.3 mm - The measure of dispersion in the sample.
Given the information, we first need to calculate the standard error (SE), which is the standard deviation (2.3 mm) divided by the square root of the sample size (18). This can be calculated as follows:
SE = 2.3 / √18 ≈ 0.54
For a 96% confidence interval, we use a Z-score of 2.05, which means we are 96% confident that the true population means lies within this interval. Now, we can calculate the confidence interval:
Lower limit = Sample mean - (Z-score × SE) = 52 - (2.05 × 0.54) ≈ 51.1 mm
Upper limit = Sample mean + (Z-score × SE) = 52 + (2.05 × 0.54) ≈ 52.9 mm
So, the 96% confidence interval for the soda cans' diameters manufactured by CO 4 is approximately 51.1 mm to 52.9 mm. This means we are 96% confident that the true average diameter of the soda cans produced by the company lies within this range.
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The sales tax rate in connecticut is 6.35%. Megan wants to buy a jacket with a $45 price tag. She has a gift card to the store she wants to use. What amount needs to be on the gift card for Megan to be able to buy the jacket using only the gift card?
Answer:
$47.82
Step-by-step explanation:
If the price of the jacket is $45 and the sales tax rate in Connecticut is 6.35%, then the total price Megan will need to pay for the jacket including tax is:
$45 + ($45 x 6.35%) = $47.82
To calculate the amount that needs to be on the gift card for Megan to buy the jacket using only the gift card, we simply subtract the total price of the jacket from $0:
$0 - $47.82 = -$47.82
Therefore, Megan needs a gift card with at least $47.82 on it to be able to buy the jacket using only the gift card.
Answer:
To calculate the amount needed on the gift card for Megan to be able to buy the jacket using only the gift card, we need to add the sales tax rate of 6.35% to the price of the jacket.
The price of the jacket is $45, so we can calculate the sales tax by multiplying $45 by 6.35% (0.0635).
$45 * 0.0635 = $2.86
The total cost of the jacket including sales tax is $45 + $2.86 = $47.86.
Therefore, Megan needs a gift card with at least $47.86 on it to buy the jacket using only the gift card.
Step-by-step explanation:
whole question i did not fell like typing it
Answer:
yes
Step-by-step explanation:
because it has a dramatic decrease in value
13. In AABC, AB-5, AC-12, and mA - 90°. In ADEF, m/D-90°, DF-12, and EF- 13. Brett claims
AABC ADEF and AABC-ADEF. Is Brett correct? Explain why.
Brett's claim that AABC is congruent or similar to ADEF is false
What do you mean by congruent triangles?Congruence of Triangles: Two triangles are said to be congruent if all three corresponding sides are equal and all three corresponding angles are equal.
From the given information, we can see that both AABC and ADEF are right triangles because they have one angle that is 90 degrees.
However, we cannot conclude that AABC and ADEF are congruent (that is, identical in size and shape) because there is not enough information to determine their side lengths and the remaining angles.
Also, we cannot conclude that AABC and ADEF are similar (ie have the same shape but possibly different sizes) because we only know one pair of corresponding angles (ie right angles) and one pair of corresponding sides (ie AC and DF), which not enough to show similarity. Therefore, Brett's claim that AABC is congruent or similar to ADEF is false, and we cannot conclude that AABC-ADEF (ie the difference between these two triangles) is a triangle with well-defined sides and angles.
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how to solve the differential equation dv/dt = -32-kv
The general solution to the differential equation dv/dt = -32 - kv is:
[tex]v = (Ke^{(-t)} - 32)/k[/tex] if kv > 0
[tex]v = (32 - Ke^{(-t)})/k[/tex] if kv < 0
How to solve this differential equation?To solve this differential equation, we need to separate the variables and integrate both sides. We can write:
dv/(32+kv) = -dt
Now, we can integrate both sides. For the left-hand side, we can use the substitution u = 32 + kv, which gives:
dv/u = -dt
Integrating both sides, we get:
ln|u| = -t + C
where C is the constant of integration. Substituting back for u, we get:
ln|32 + kv| = -t + C
To solve for v, we can exponentiate both sides:
[tex]|32 + kv| = e^{(-t+C)} = Ke^{(-t)}[/tex]
where K is another constant of integration.
Taking the absolute value of both sides is necessary because kv can be negative. To solve for v, we need to consider two cases: kv is positive and kv is negative.
If kv is positive, then we have:
[tex]32 + kv = Ke^{(-t)}[/tex]
Solving for v, we get:
[tex]v = (Ke^{(-t)} - 32)/k[/tex]
If kv is negative, then we have:
[tex]-(32 + kv) = Ke^{(-t)}[/tex]
Solving for v, we get:
[tex]v = (32 - Ke^{(-t)})/k[/tex]
Therefore, the general solution to the differential equation dv/dt = -32 - kv is:
[tex]v = (Ke^{(-t)} - 32)/k[/tex] if kv > 0
[tex]v = (32 - Ke^{(-t)})/k[/tex]if kv < 0
where K and k are constants of integration that depend on the initial conditions.
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The sum of two fractions is 11/12. If one fraction is 1/4 what is second fraction
determine whether the series is convergent or divergent. [infinity] ln n2 8 7n2 2 n = 1. convergent divergent If it is convergent, find its sum. (If the quantity diverges, enter DIVERGES.)
Sum of the series [infinity] ln n² / (8 + 7n²)² is π² / 6.
Series [infinity] 1/n² convergent to π² / 6.
To determine the convergence or divergence of the series [infinity] ln n² / (8 + 7n²)²?We can use the limit comparison test.
First, note that both ln n² and (8 + 7n²)² are positive for all n ≥ 1.
Let a_n = ln n² / (8 + 7n²)².
Then, consider the series b_n = 1/n².
We know that b_n is a convergent p-series with p = 2.
Next, we take the limit of the ratio of a_n and b_n as n approaches infinity:
lim (n→∞) a_n / b_n = lim (n→∞) (ln n² / (8 + 7n²)²) / (1/n²)
Using L'Hôpital's rule twice, we can simplify this limit as follows:
= lim (n→∞) [(2/n) / (-28n / (8 + 7n²))]
= lim (n→∞) -14n / (8 + 7n²)
Since the numerator and denominator both approach infinity as n approaches infinity, we can apply L'Hôpital's rule again:
= lim (n→∞) -14 / (14n)
= 0
Since the limit is finite and positive, we can conclude that the series [infinity] ln n² / (8 + 7n²)² converges by the limit comparison test.
To find its sum, we can use a known result that the series [infinity] 1/n² converges to π² / 6.
Therefore, the sum of the series [infinity] ln n² / (8 + 7n²)² is π² / 6.
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A random selection of students was asked the question “What type of gift did you last receive?” and the results were recorded in the relative frequency bar graph.
What is the experimental probability that a student chosen at random received a gift card or money? Express your answer as a decimal.
The solution is : 1 / 13, is the probability that the card chosen is a queen.
Here, we have,
given that,
A card is chosen at random from a standard deck of 52 playing cards.
so, we get,
Total number of cards = 52
Probability of choosing a queen:
In a deck of card there are 4 queens
Probability = 4/52
= 1 / 13
Hence, 1 / 13, is the probability that the card chosen is a queen.
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complete question:
A card is chosen at random from a standard deck of 52 playing cards. What is the probability that the card chosen is a queen?
According to a recent study teenagers spend, on average, approximately 5 hours online every day (pre-Covid). Do parents realize how many hours their children are spending online? A family psychologist conducted a study to find out. A random sample of 10 teenagers were selected. Each teenager was given a Chromebook and free internet for 6 months. During this time their internet usage was measured (in hours per day). At the end of the 6 months, the parents of each teenager were asked how many hours per day they think their child spent online during this time frame. Here are the results. 1 2 3 4 5 6 7 8 9 10 5.9 6.2 4.7 8.2 6.4 3.8 2.9 Teenager Actual time spent online (hours/day) Parent perception (hours/ Difference (A-P) 7.1 5.2 5.8 2.5 3 3.2 3 1.7 3.5 4.7 1.5 4.9 2 1.8 2 0.9 3 4.1 2.5 2.7 3 2.8 3.4 a. Make a dotplot of the difference (A-P) in time spent online (hours/day) for each teenager. What does the dotplot reveal? I Lesson provided by Stats Medic (statsmedic.com) & Skew The Script (skewthescript.org) Made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License (https://creativecommons.org/licenses/by-nc-sa/4.0) + b. What is the mean and standard deviation of the difference (A - P) in time spent online. Interpret the mean difference in context. c. Construct and interpret a 90% confidence interval for the true mean difference (A - P) in time spent online.
a. The dotplot of the difference (A-P) in time spent online shows that most parents underestimated the amount of time their children spent online during the 6-month period. The majority of the differences are positive, indicating that the actual time spent online was greater than the parents' perception.
How to determine the mean difference?b. The mean difference (A-P) in time spent online is (7.1-5.9+5.2-6.2+5.8-4.7+2.5-8.2+3-6.4)/10 = -0.3 hours per day. The standard deviation of the differences can be calculated using a formula or a calculator, and it is approximately 2.82 hours per day. This means that the average difference between the actual time spent online and the parents' perception was a small underestimate of 0.3 hours per day, with a variation of approximately 2.82 hours per day.
c. To construct a 90% confidence interval for the true mean difference (A-P) in time spent online, we can use the formula:
mean difference ± t-value (with 9 degrees of freedom) x (standard deviation / square root of sample size)
Using a t-table, the t-value for a 90% confidence interval with 9 degrees of freedom is approximately 1.83. The standard error of the mean difference is the standard deviation divided by the square root of the sample size, which is 2.82 / sqrt(10) = 0.89. Therefore, the 90% confidence interval for the true mean difference is:
-0.3 ± 1.83 x 0.89
This simplifies to -0.3 ± 1.63, or (-1.93, 1.33) hours per day. This means that we are 90% confident that the true mean difference between the actual time spent online and the parents' perception falls within this interval. Since the interval includes zero, we cannot reject the null hypothesis that there is no difference between the actual time spent online and the parents' perception at the 5% level of significance. However, the interval suggests that there could be a small underestimate or overestimate of the actual time spent online by the parents.
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