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In a random sample of 88 ​people, the mean commute time to work was 35.5 minutes...

In a random sample of 88 ​people, the mean commute time to work was 35.5 minutes and the standard deviation was 7.4 minutes. A 98​% confidence interval using the​ t-distribution was calculated to be left (27.7,43.3). After researching commute times to​ work, it was found that the population standard deviation is 8.7 minutes. Find the margin of error and construct a 98% confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.

Margin of Error U = ________

Math   Statistics-And-Probability   
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