Posted by Koia on Thursday, May 10, 2012 at 6:08am.
A researcher conducted a study of the access speed of 40 hard drives and concluded that his
maximum error of estimate was 15. If he were to conduct a second study to reduce the
maximum error of estimate to 5, about how many hard drives should he include in his new
sample?

statistics  PsyDAG, Thursday, May 10, 2012 at 9:53am
SEm = SD/√n
15 = SD/√40 (Calculate SD and insert below.)
5 = SD/√?

statistics  Anonymous, Monday, December 5, 2016 at 5:09pm
A researcher conducted a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. 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?
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