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In a random sample of 8 people, the mean commute time to work was 33.5 minutes...

In a random sample of 8 people, the mean commute time to work was 33.5 minutes and the standard deviation was 7.4 minutes. A 98​% confidence interval using the​t-distribution was calculated to be (25.7,41.3). After researching commute times to​ work, it was found that the population standard deviation is 8.6 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.

The margin of error of is?

A 98​% confidence interval using the standard normal distribution is?

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