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In a random sample of 8 people, the mean commute time to work was 36.5...

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Basic Math

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In a random sample of 8 people, the mean commute time to work was 36.5 minutes and the standard deviation was 7.2 minutes. A 98% confidenceinterval using the t-distribution was calculated to be (28.9,44.1). After researching commute times to work, it was found that the population standarddeviation is 8.7 minutes. Find the margin of error and construct a 98% confidence interval using the standard normal distribution with the appropriatecalculations for a standard deviation that is known. Compare the results.

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