Question

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 90% confidence interval using the t-distribution was calculated to be (28.5,38.5). After researching commute times to work, it was found that the population standard deviation is 9 5 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 H is (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.) D Compare the results Choose the correct answer below O A. The confidence interval found using the standard normal distribution is narrower than the O B. The confidence interval found using the standard normal distribution is wider than the confidence interval found using the student's t-distribution confidence interval found using the student's t-distribution upper confidence interval limits confidence interval found using the student's t-distribution C. The confidence interval found using the standard normal distribution has smaller lower and O D. The confidence interval found using the standard normal distribution is the same as the y Statis son Click to select your answer(s)

Answer 1