posted by Alia .
Please forgive me for posting this for the 3rd time but I really need to learn this:
A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in his new sample?
Please can someone explain me how to do the above problem.
My working: 28/7 = 4, so 4^2=16
16 x 45 =720.
I am not sure if the above working is correct but please i really need help in learning this problem (question). So, Please can anyone assist me by showing the correct method for this.