Question

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 200 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.

​(Round up to the nearest whole​ number.)

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

A. There may not be 1 comma 270 computer users to survey.

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

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

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

Answer 1

Solution :

Given that,

Z_/2 = 1.96

sample size = n = [Z_/2* / E] ²

n = [1.96 * 200 / 11]²

n = 1270

The minimum sample size required is 1270 computer users.

A. There may not be 1 comma 270 computer users to survey.