1. A survey of

493

women revealed that

34%

wear flat shoes to work.

a.

Use this sample information to develop a

99%

confidence interval for the population proportion of women who wear flat shoes to work.

b.

Suppose that the people who administered this survey now wish to estimate the proportion of women who wear athletic shoes to work with a margin of error of 0.01 with

95%

confidence. Determine the sample size required.

a.

enter your response herepenter your response here

(Round to three decimal places as needed.)

b.

n=enter your response here

(Round up to the nearest whole number.)

2. Determine the smallest sample size required to estimate the population mean under the given specifications in parts a through d below.

a.

e=2.2,

confidence

level=80%,

data between

80

and 120

The smallest sample size required to estimate the population mean is

enter your response here.

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

b.

e=2.2,

confidence

level=90%,

data between

80

and 120

The smallest sample size required to estimate the population mean is

enter your response here.

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

c.

e=4.4,

confidence

level=90%,

data between

80

and 120

The smallest sample size required to estimate the population mean is

enter your response here.

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

d.

e=4.4

confidence

level=90%,

data between

70

and 130

The smallest sample size required to estimate the population mean is

enter your response here.

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