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A researcher wishes to estimate the mean number of miles on 3-year-old Chevy Cavaliers.

a. How many cars should be in a sample to estimate the mean number of miles within 2000 miles with 98% confidence, assuming that σ=16,100? 6 pts

b. How many cars should be in a sample to estimate the mean number of miles within 1000 miles with 98% confidence, assuming that σ=16,100?

 

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