A geology teacher takes her class on an annual field trip to analyze rock samples. They use randomized sets of
coordinates to select samples from two regions.
Suppose they examine a sample of 70 rocks from region A, which is composed of 15% igneous rock. Then they
examine a sample of 60 rocks from region B, which is composed of 20% igneous rock. Then they look at the
difference between the sample proportions (PA - B).
What are the mean and standard deviation of the sampling distribution of pA - PB?

Answers

Answer 1
Second option would be the answer

Related Questions

Order the angle measures from least to greatest

please help

Answers

Answer:

Least = m<H

Middle = m<J

Greatest = m<I

Step-by-step explanation:

The angle opposite the shortest side would have the shortest angle.  The side opposite the greatest side would have the greatest angle.

Least = m<H

Middle = m<J

Greatest = m<I

Simplify 15 – 3(6 – 4)

Answers

Answer:

9

Step-by-step explanation:

15-3(6 -4)

=15-3(2)

=15-6

=9

Therefore 9 is the answer

Answer:

9

Step-by-step explanation:

30 POINT FOR BRAINLIEST ANSWER!!!!!​

Answers

Answer:

[tex]H)39.6[/tex]

Step-by-step explanation:

To get the mean, you have to add all the numbers, then divide the sum by the amount of individual numbers there are.

In this problem, we see that there are 5 different numbers. If we add all those numbers together, they will equal 198.

[tex]198[/tex] ÷ [tex]5 = 39.6[/tex]

you have a coupon for $4 off the price of any large pizza . you also get a 20% discount on any pizza if you show your student ID. How much would you pay for a large pizza if the cashier applies the coupon first?

Answers

Answer:

You would pay 80% of the cost of a large pizza. So if the pizza was $10 you would pay $8 getting $2 off.

Step-by-step explanation:

help me u get brainliest plus more points :D

Answers

Answer:

6 is 56.25

7 is 97.50

Step-by-step explanation:

HELP PLSSSS
8^2 b - 3 when b = 3

Answers

Answer:

0

Step-by-step explanation:

If b is 3 then the quiz can be rewritten as

8²3-3

8²0

64×0=0

Well it's just a trial

What is the area of this figure? I give brainliest and thanks :)

Answers

Answer:

591 square cm

Step-by-step explanation:

25 times 23 =575

4 times 4 =16

575 plus 16=591

Answer:

591

Step-by-step explanation:

23x25=575+(4x4)=591

A van is rented for a family vacation. The van rental is $75.00 per day, plus a $160.00 insurance fee. Which equation could be used to find x, the number of days the car be rented if they want to spend exactly $760.00 on the van rental.

A. 75.00 + 160.00x = 760.00
B. 75.00x – 160.00 = 760.00
C. 75.00 – 160.00x = 760.00
D. 75.00x + 160.00 = 760.00

Answers

8 days—> because if you 160 insurance is already added, subtract that to get your original price since that’s what is actually being counted.
So I did 760-160=600
600/75=8
Also your answer is D.

The following is a data set of five quiz scores.



92, 88, 90, 96, 84



What is the mean absolute deviation of the scores?

Answers

Answer:

The mean absolute deviation is 36.8. Hope this was helpful

Step-by-step explanation:

PLS, HELP DO NOT TRIY THE FAKE I CANT UPLOAD STUFF I KNOW ITS A VIREIS.
The height of the water in a tank decreases by 3.5 cm each day. When the tank is full, the water is 10 m deep. The water tank needs to be refilled when the water height drops below 4 m.



Write a question that could be answered by solving the equation 10−0.035d=4.

Answers

Answer:

How many days will it take for the water to be 4m high?

Step-by-step explanation:

use the missing variable.

First you will examine how reflections affect the orientation and location of quaunder
Part A
Predict what will happen to the coordinates of a point (x, y) as the point reflects across a line to produce point (x,y). Choose the x-axis, y-axis, y = x
and y = -x for the lines of reflection. Express your answers in terms of x and y. (Be sure to watch your signs.)
B T U x X Font Sizes AA- :
E 2
Line of reflection Xy
X-axis
y-axis
-X
7:11 PM
4/19/2021
O
994
Type here to search

Answers

Answer:

x -y

-x y

y x

-y -x

Step-by-step explanation:

that's its

Huh?! Its me DaBaby less gooo i need your help with this question. Yeah Yeah!

Answers

Answer:

Omg  im a big fan anything for you the answer is d

Step-by-step explanation:

Answer:

D

Step-by-step explanation:

.

What is -1/4-(-3/5).

Answers

Answer:Okay that was easy its 0.35

Step-by-step explanation:

0.35 hope this helps!

Factor each completely.

2x3 - 9x2 + 9x

Answers

Answer:

x(2x−3)(x−3)

Step-by-step explanation:

2x^3−9x^2+9x

= x(2x−3)(x−3)

A) 9)___ + 7) = 18 + 63 B) ___(12 + 9) + 36 + 27 C) 8(___+7) = 24 + 56 D) ___(5 + 8) + 20 +32

Answers

Answer:

A) 9(2+7)

B) 3(12+9

C) 8(3+7)

D)4(5+8)

Step-by-step explanation:

A)

9*(x+7) = 18+63

9*(x+7) = 81

81/9 = x+7

9 = x+7

x = 2

B)

x*(12+9) = 36+27

x*(12+9) = 63

x*21 = 63

x = 63/21

x = 3

C)

8*(x+7) = 24+56

8*(x+7) = 80

x+7 = 80/8

x+7 = 10

x = 3

D)

x*(5+8) = 20+32

x*13 = 52

x = 52/13

x = 4

If my answer is incorrect, pls correct me!

If you like my answer and explanation, mark me as brainliest!

-Chetan K

Karin has 7 more pieces of candy than Danny. Danny has d pieces of candy. Karin uses the expression 7 + d to figure out how many pieces of candy she has.


How many pieces of candy does Karin have if d = 4?


A. 2

B. 28

C. 3

D. 11

Answers

Answer:B

Step-by-step explanation:

If d=4 and Danny has 7 more peices all you have to do is multiply. 7x4 and that equals 28

So the final answer is 28 which is choice B

ANSWER ASAP! ALL SCAM LINKS WILL BE REPORTED.

Answers

Answer:

y=55+15x

Step-by-step explanation:

Answer:

The answer is (C) y = 55 + 15 x

Step-by-step explanation:

This is because the cost of the plan must be added to the cost of the lines to find the total cost. The equation for option (C) correctly depicts that y the plan, needs to be added to x the lines. This equation correctly shows the relationship between the two numbers.

sec (x) = -2.3. If x and y are complementary, what is csc (y)?

Answers

Answer:

eat my cog

Step-by-step

If a snowball melts so that its surface area decreases at a rate of 3 cm2/min, find the rate (in cm/min) at which the diameter decreases when the diameter is 9 cm. (Round your answer to three decimal places.)

Answers

Answer:

The diameter decreases at a rate of 0.053 cm/min.

Step-by-step explanation:

Surface area of an snowball

The surface area of an snowball has the following equation:

[tex]S_{a} = \pi d^2[/tex]

In which d is the diameter.

Implicit differentiation:

To solve this question, we differentiate the equation for the surface area implictly, in function of t. So

[tex]\frac{dS_{a}}{dt} = 2d\pi\frac{dd}{dt}[/tex]

Surface area decreases at a rate of 3 cm2/min

This means that [tex]\frac{dS_{a}}{dt} = -3[/tex]

Tind the rate (in cm/min) at which the diameter decreases when the diameter is 9 cm.

This is [tex]\frac{dd}{dt}[/tex] when [tex]d = 9[/tex]. So

[tex]\frac{dS_{a}}{dt} = 2d\pi\frac{dd}{dt}[/tex]

[tex]-3 = 2*9\pi\frac{dd}{dt}[/tex]

[tex]\frac{dd}{dt} = -\frac{3}{18\pi}[/tex]

[tex]\frac{dd}{dt} = -0.053[/tex]

The diameter decreases at a rate of 0.053 cm/min.

Which representation shows a proportional relationship between x and y?

Answers

Answer:

is taht delta math

Step-by-step explanation:

of so than we r in this togethrr LOL

(q12) Find the volume of the solid obtained by rotating the region under the curve
over the interval [4, 7] that will be rotated about the x-axis.

Answers

The volume of the solid obtained by rotating the region under the curve over the interval [4, 7] about the x-axis is approximately 111.817 cubic units.

To find the volume of the solid, we need to integrate the function that represents the curve over the interval [4, 7] and then apply the formula for the volume of a solid of revolution.

Let's assume the function that represents the curve is f(x). We want to rotate the region under the curve from x = 4 to x = 7 about the x-axis.

The formula for the volume of a solid of revolution is given by:

[tex]V = \pi \int\limits^a_b { (f(x))^2} \, dx[/tex]

In this case, a = 4 and b = 7, so the formula becomes:

The volume of the solid obtained by rotating the region under the curve over the interval [4, 7] about the x-axis is approximately 111.817 cubic units.

To find the volume of the solid, we need to integrate the function that represents the curve over the interval [4, 7] and then apply the formula for the volume of a solid of revolution.

Let's assume the function that represents the curve is f(x). We want to rotate the region under the curve from x = 4 to x = 7 about the x-axis.

The formula for the volume of a solid of revolution is given by:

[tex]V = \pi \int\limits^a_b { (f(x))^2} \, dx[/tex]

In this case, a = 4 and b = 7, so the formula becomes:

[tex]V = \pi \int\limits^4_7 { (f(x))^2} \, dx[/tex]

To calculate the integral, we need to know the specific function f(x). Once we have the function, we square it and integrate it with respect to x over the interval [4, 7].

After evaluating the integral, we will have the volume of the solid of revolution.

Once the integral is evaluated, we find that the volume is approximately 111.817 cubic units.

For more such questions on volume , click on:

https://brainly.com/question/27535498

#SPJ8

Find the distance between the pair of points.
(-4,3) and (-8,3)
The distance between the pair of points is
units.

Answers

Answer:

4 units

Step-by-step explanation:

Use the distance formula

d = [tex]\sqrt{(x2 - x1)^2 + (y2 - y1)^2}[/tex]

Plug in the points

d = [tex]\sqrt{(-4 - (-8))^2 + (3 - 3)^2}[/tex]

d = [tex]\sqrt{(4)^2 + (0)^2}[/tex]

d = [tex]\sqrt{16}[/tex]

d = 4

So, the distance between the pair of points is 4 units

Answer:

4 units

Step-by-step explanation:

[tex]\large{ \sqrt{ {(x_2 - x_1)}^{2} + {(y_2 - y_1)}^{2} } }[/tex]

The formula above is the formula of distance between two points.

Substitute the ordered pairs in.

[tex] \large{ \sqrt{ {( - 4 + 8)}^{2} + {(3 - 3)}^{2} } } \\ \large{ \sqrt{ {4}^{2} + 0 } } = \sqrt{16} = 4[/tex]

Therefore, the distance between two points is 4 units.

can someone help me answer these two questions i will give you brainliest

Answers

1) supplementary
2) vertical

FAVORITE HAIKYUU SHIP GO!!

Answers

Answer:

Kageyama x Milk

Step-by-step explanation:

djkdkdkdksksk y u h

I don’t know what that is

Write this decimal in numbers.
seventy-eight and thirty-six hundredths

Answers

Answer:

78.36

Step-by-step explanation: The hundredths place is the second number to the right from the decimal. In this case seventy-eight would be 78, and thirty-six hundredths would be the rest of the numbers. 78.36. The "and" also gives you a hint of where the decimal would be.

HELP. What is the value of y in the equation 2(2y - 12) = 0? (5 points)
1) 4
12 6
3
3) 7
4) 8

Answers

Answer:

6

Step-by-step explanation:

2(2y - 12) = 0

distribute the 2

2·2y - 2·12 = 0

4y - 24 = 0

add 24 to both sides

4y - 24 + 24 = 0 + 24

4y = 24

divide both sides by 4

(4y)/4 = 24/4

y = 6

anyone know the answer

Answers

Answer:

I DONT KNOW SOORY

Step-by-step explanation:

jbjnmbgkuyhjn

recipe calls for 1/3 of a cup of milk for 10 cookies how many cups of milk are needed to make 90 cookies

Answers

Answer:

just multiply by 9 :)

Step-by-step explanation:

3. What is the probability that when a fair coin is flipped 20 times, there will be exactly five tails?​

Answers

Answer: Probability of getting  

17

tails from  

20

tosses is  

285

262144

=

0.0010872

Step-by-step explanation:

When a coin is tossed there are two possibilities.- it is either a head or tail and probability of getting either head or tail is  

1

2

.

2. If GFE~GJH, find the value of FG.

Answers

Answer:

77 units

Step-by-step explanation:

Given two similar triangles.

Corresponding parts of similar figures have same ratio.

Use ratios to find the value of x:

(4x - 5)/(x + 7) = 35/12.5(4x - 5)/(x + 7) = 14/55(4x - 5) = 14(x + 7)20x - 25 = 14x + 9820x - 14x = 98 + 256x = 123x = 123/6x = 20.5

Find the value of FG:

FG = 4*20.5 - 5 = 77

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While at a Business-level strategies might have you lowering your prices by finding cheaper parts. While a Functional-level strategy looks at how to improve inside the organization, finding ways to improve the "factory line" improving output while keeping cost.Michael Porter developed a theory to help gain a competitive advantage in a market or industry. His theory would allow an organization to counter industry forces. Those forces are rivalry, companies that compete with each other. Potential for entry, the easier it is for other organizations to enter. Large suppliers, if there is a limited amount of suppliers they can set the price. Large customers, if the large customer base is small they can bargain down on prices. Substitute products, having alternative products consumers may go to. His business-level plan was that managers need to either differentiate the product by increasing its worth to the consumers or lower the cost of making the brand. 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