You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats.

Post by **answerhappygod** » Tue Jul 05, 2022 9:21 am

: You Are The Operations Manager For An Airline And You Are Considering A Higher Fare Level For Passengers In Aisle Seats 1 (15.55 KiB) Viewed 28 times

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 passengers must you survey? Assume that you want to be 95% confident that the sample percentage is within 2.5 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 38% of air passengers prefer an aisle seat. n= (Round up to the nearest integer.)

In a test of the effectiveness of garlic for lowering cholesterol, 48 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (before-after) in their levels of LDL cholesterol (in mg/dL) have a mean of 4.3 and a standard deviation of 19.1. Construct a 90% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol? Click here to view at distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. What is the confidence interval estimate of the population mean μ? mg/dL <μ< mg/dL (Round to two decimal places as needed.) What does the confidence interval suggest about the effectiveness of the treatment? O A. The confidence interval limits contain 0, suggesting that the garlic treatment did affect the LDL cholesterol levels. OB. The confidence interval limits do not contain 0, suggesting that the garlic treatment did affect the LDL cholesterol levels. O C. The confidence interval limits do not contain 0, suggesting that the garlic treatment did not affect the LDL cholesterol levels. O D. The confidence interval limits contain 0, suggesting that the garlic treatment did not affect the LDL cholesterol levels.