In order to estimate the mean amount of time computer users

In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 95% confident that your sample mean is within

11 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 227 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated minimum required sample size.

The minimum sample size required is ?? computer users.

What is a major obstacle to getting a good estimate of the population mean?

A.

The data does not provide information on what the computer users did while on the internet.

B.

It is difficult to precisely measure the amount of time spent on the internet, invalidating some data values.

C.

There may not be 1,636 computer users to survey.

D.

There are no obstacles to getting a good esitmate of the population mean.

Solution

In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 95% confident that your sample mean is within

11 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 227 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated minimum required sample size.

The minimum sample size required is 1636 computer users.

Data

Population Standard Deviation

227

Sampling Error

11

Confidence Level

95%

Intemediate Calculations

Z Value

1.9600

Calculated Sample Size

1635.9217

Result

Sample Size Needed

1636

What is a major obstacle to getting a good estimate of the population mean?

a. The data does not provide information on what the computer users did while on the internet.

b. It is difficult to precisely measure the amount of time spent on the internet, invalidating some data values.

c.There may not be 1,636 computer users to survey.

d. There are no obstacles to getting a good esitmate of the population mean.