Please answer the following problem and show work In order to estimate the mean
ID: 3297051 • Letter: P
Question
Please answer the following problem and show work
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 90% confident that your sample mean is within 14 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 220 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 669 computer users to survey. B. The data does not provide information on what the computer users did while on the internet. C. It is difficult to precisely measure the amount of time spent on the internet, invalidating some data values. D. There are no obstacles to getting a good estimate of the population mean.Explanation / Answer
n = (zc * SD)^2/E^2
zc is the critical value for 10% level of significance from normal table as 1.645
SD = 220
E = 14
n = (1.645*220)^2/14^2
= 668.22
~ 668
Answers:
The minimum sample size is required is 668 computer users.
D. There are no obstacles to getting a good estimate of the population mean.