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Question

Suppose a clothing store wants to determine the current percentage of customers who are over the age of forty. How

many customers should the company survey in order to be 92%

 confident that the estimated (sample) proportion is within 3

 percentage points of the true population proportion of customers who are over the age of forty?

z

0.16

0.994

z

0.08

1.405

z

0.04

1.751

z

0.02

2.054

z

0.01

2.326

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