We Intend to Estimate the Average Driving Time of a Group

question 19

Multiple Choice

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 7 minutes. We want
Our 90 percent confidence interval to have a margin of error of no more than plus or minus 4
Minutes. What is the smallest sample size that we should consider?

• A)9
• B)34
• C)3
• D)2

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