According to Scarborough Research, more than 85% of working adults commute by car. Of all U.S. cities, Washington, D.C., and New York City have the longest commute times. A sample of 30 commuters in the Washington, D.C., area yielded the following commute times, in minutes.

a. Find a 90% confidence interval for the mean commute time of all commuters in Washington, D.C. (Note: . x = 27.97 minutes and s = 10.04 minutes.)
b. Interpret your answer from part (a).

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