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Twenty people in one large metropolitan area were asked to

Twenty people in one large metropolitan area were asked to record the time (in minutes) that it takes them to drive to work. These times were as follows:

30 42 35 40 45 22 32 15 41 45

28 32 45 27 47 50 30 25 46 25

a. Calculate the standard error.

b. Find tv,α/2 for a 95% confidence interval for the true population mean.

c. Calculate the width for a 95% confidence interval for the population mean time spent driving to work.

30 42 35 40 45 22 32 15 41 45

28 32 45 27 47 50 30 25 46 25

a. Calculate the standard error.

b. Find tv,α/2 for a 95% confidence interval for the true population mean.

c. Calculate the width for a 95% confidence interval for the population mean time spent driving to work.

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