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In a random sample of 8 ​people, the mean commute time to work was 35.5 minutes...

In a random sample of 8 ​people, the mean commute time to work was 35.5 minutes and the standard deviation was 7.4 minutes. A 90​% confidence interval using the​ t-distribution was calculated to be (30.5,40.5). After researching commute times to​ work, it was found that the population standard deviation is 9.2 minutes. Find the margin of error and construct a 90​% confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results. Round to one decimal point

The Margin of error for the mean is?

a 90% confidence interval using the standard normal distribution is?

Compare the results

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