Test: Chapter 7 Test Question 1 of 9 possible This question: 1 Submit test point(s) possible You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 90% confident that the sample percentage is within 5.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. n= (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 35% of air passengers prefer an aisle seat. n= (Round up to the nearest integer.) Test: Chapter 7 Test Question 2 of 9 This question: 1 Submit test point(s) possible Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 98% confidence interval estimate of the population standard deviation. 63 61 61 57 61 52 60 59 60 69 59 68 Click the icon to view the table of Chi-Square critical values. The confidence interval estimate is mi/h