We intend to estimate the average driving time of a group of…
We intend to estimate the average driving time of a group of commuters. From a previous study, we believe that the average time is 42 minutes with a standard deviation of [s] minutes. We want our 99% confidence interval to have a margin of error of no more than plus or minus [E] minutes. What is the smallest sample size? Hint: Don’t forget that if you are using the formulas, your answer must be a whole number, rounded up.
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