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Natalka [10]
3 years ago
10

Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the dif

ference between proportions of men and women who own smartphones. Assume that you want 90â% confidence that your error is no more than 0.02.
The sample size needed to estimate the difference between two population proportions to within a margin of error E with a confidence level of 1 - α can be found by using the following expression:
E = zα/2âp1q1/n1 + p2q2/n2
Replace n1 and n2 by n in the preceding formula (assuming that both samples have the same size) and replace each of p1, q1, p2, and q2 by 0.5 (because their values are not known). Solving for n results in this expression:
n = Z2α/2/2E^2
Mathematics
1 answer:
Orlov [11]3 years ago
5 0

Answer:

n= p1+q1×p2 4pq

n= q2÷ 0.5= q4.5

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Shawna has 4/5 ounces of juice. She drinks 3/4 of it. How much is left
Bezzdna [24]

Answer:

0.05

Step-by-step explanation:

I turned the fractions into decimals. to do that your do exactly as it tells you!

4 divided by 5 = 0.8

so she has 0.8 ounces of juice (That not alot lol I would not be satisfied) now for how much she drank...

3 divided by 4 =0.75

0.80 - 0.75 = 0.05

She drank 0.05 ounces

Hope this helped! Please mark as brainliest! Thanks! If you need me to turn 0.05 in a fraction i can do that.

4 0
3 years ago
Please help me. i will mark you as most brilliance and give you 5 stars! Please be specific when answering. thank you! :)
serg [7]

Step-by-step explanation:

5x+52=9x+20

subtract 5x on both sides

subtract 20 on both sides

32=4x

divide by 4 on both sides

x=8

plug in x to the equations for A, D, and C

A and D are 92°

C is 56°

B and C will add up to 90, so

90-56=34°

13y-6=34

add 6 on both sides

13y=40

divide by 13

y=40/13 (I don't wanna calculate that)

7 0
2 years ago
To find the area of a triangle, you can use the expression b times h divided by 2, where b is the base of the triangle and h is
vladimir1956 [14]

Answer:

16  sq. units

Step-by-step explanation:

<u>The formula for the area of a triangle:</u>

  • A = 1/2bh

<u>If base and height are known as:</u>

  • b = 8 units and h = 4 units

<u>Then the area is:</u>

  • A = 1/2*8*4 = 16 sq. units
4 0
3 years ago
A ball is dropped from a height of 9 m. Each time it strikes the ground it bounces vertically to a height that is 2/3 of the pre
vredina [299]

Answer:

The answer i 9

Step-by-step explanation:

If the ball bounces 2/3 of the height of 9, and a 1/3 of 9 is 3, then 6 is the answer.

6 0
2 years ago
Which of the following numbers is irrational?
love history [14]
the square root of three when multiplied by itself if the number three it is more precisely call the principal square root of three the square root of three is an irrational number approved the irrationality
6 0
3 years ago
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