In a random sample of 8 people, the mean commute time to work was 35.5 minutes and the standard deviation was 7.2 minutes. A 90% confidence interval using the t-distribution was calculated to be (30.7,40.3). 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. ..... The margin of error of u is 5.35. (Round to two decimal places as needed.) A 90% confidence interval using the standard normal distribution is ( D (Round to one decimal place as needed.) ces

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