Use the expression in the accompanying discussion of sample size to find the size of each...
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
9090%
confidence that your error is no more than
0.040.04.
LOADING...
Click the icon to view the discussion of sample size.
The sample should include
nothing
men and
nothing
women.
(Type whole numbers.)
Homework Answers
Solution :
Given that,
E = 0.04
Zalpha/2 = 1.645
Phat = 0.5
1 - phat = 0.5
n = (Zalpha/2 / E)2 * phat * (1-phat)
=( 1.645 / 0.04)2 * 0 5 * 0.5
= 423
Sample size = 423
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