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41. Miles on a Saturn A researcher wishes to estimate the mean number of miles on...

41. Miles on a Saturn A researcher wishes to estimate the mean number of miles on 4-year-old Saturn SC1s. from prior tudy it was found that the standard deviation =19,700

(a) How many cars should be in a sample to estimate the mean number of miles within 1000 miles with 90% confidence, assuming that

(b) How many cars should be in a sample to estimate the mean number of miles within 500 miles with 90% confidence, assuming that

(c) What effect does doubling the required accuracy have on the sample size? Why is this the expected result?

Math   Statistics-And-Probability   
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