Math 227 Elementary Statistics Spring 2022 martha gomez 05/27/22 6:55 PM @ E Quiz: Chapter 6 Quiz Question 5 of 10 This quiz: 50 point(s) possible This question: 5 point(s) possible Submit quiz In a random sample of 8 people, the mean commute time to work was 34.5 minutes and the standard deviation was 7.2 minutes. A 95% confidence interval using the t-distribution was calculated to be (28.5,40.5). After researching commute times to work, it was found that the population standard deviation is 9.7 minutes. Find the margin of error and construct a 95% 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]. (Round to two decimal places as needed.) A 95% confidence interval using the standard normal distribution is (].) (Round to one decimal place as needed.) Compare the results. Choose the correct answer below. O A. The confidence interval found using the standard normal distribution is the same as the confidence interval found using the student's t-distribution. O B. The confidence interval found using the standard normal distribution is narrower than the confidence interval found using the student's t-distribution. O C. The confidence interval found using the standard normal distribution is wider than the confidence interval found using the student's t-distribution. O D. The confidence interval found using the standard normal distribution has smaller lower and upper confidence interval limits