In order to estimate the mean amount of time computer users spend on the interne

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 ordered to be 90% confident that your sample mean is within 12 minutes of the population mean assume that the standard deviation of the population of monthly Time'spent been on the Internet is 191 minute what is a major obstacle to getting a good estimate a population mean use technology to find the estimated minimal requirement sample size

the minimum sample size read is ? computer users

What is a major osco to getting a good S name of population mean?

In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users r internet is 191 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the e 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? O A. It is difficult to precisely measure the amount of time spent on the internet, invalidating some data values. O B. The data does not provide information on what the computer users did while on the internet. ° C. There may not be 686 computer users to survey. D D. There are no obstacles to getting a good esitmate of the population mean

Explanation / Answer

solution=
given information
Error E =12
the population standard deviation sigma=191
confidence interval =1- alpha =90%
the formula for sample size requried is
sample size n=( Z ?/2*sigma/E)^2
from standard normal table corresponding 95% confidence level
Z?/2 = 1.645
n=( 1.645*191/12)^2= 685.55
therefore, the minimumsample size required n= 686
b) it is difficult to precisely measure the amount of time spent on the internet ,invidating some data values

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