Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the difference between proportions of men and women who own smartphones. Assume that you want 90% confidence that your error is no more than 0.02. A Click the icon to view the discussion of sample size. - X Sample size discussion The sample should include men and women. (Type whole numbers.) 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-a can be found by using the following expression:
Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the difference between proportions of men and women who own smartphones. Assume that you want 90% confidence that your error is no more than 0.02. A Click the icon to view the discussion of sample size. - X Sample size discussion The sample should include men and women. (Type whole numbers.) 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-a can be found by using the following expression:
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the difference between proportions of men and women who own smartphones. Assume that you want 90% confidence
that your error is no more than 0.02.
A Click the icon to view the discussion of sample size.
Sample size discussion
The sample should include
(Type whole numbers.)
men and
women.
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-a can be
found by using the follow
expression:
P2 92
P191
E=Za/2
n2
Replace n, and n, by n in the preceding formula (assuming that both samples
have the same size) and replace each of p,91, P2, and q, by 0.5 (because their
values are not known). Solving for n results in this expression:
za12
.2
2E
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