A magazine company is planning to survey customers to determine the proportion who will renew their subscription for the coming year. The magazine wants to estimate the population proportion with

95%

confidence and a margin of error equal to

0.04.

What sample size is required?

The required sample size is

enter your response here

customers.

(Round up to the nearest whole number as needed.)

Confidence Level	Critical Value
80%	z=1.28
90%	z=1.645
95%	z=1.96
99%	z=2.575

2.Assuming the population of interest is approximately normally distributed, construct

a

90%

confidence interval estimate for the population mean given the values below.

x=19.7

s=4.7

n=21

The

90%

confidence interval for the population mean is from

enter your response here

to

enter your response here.

(Round to two decimal places as needed. Use ascending order.)