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 be92%

confident that the estimated (sample) proportion is within5

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

z

0.16

z

0.08

z

0.04

z

0.02

z

0.01

0.994

1.405

1.751

2.054

2.326