(Solved): Activity 4 - Additional Practice: Gas mileage, in miles per gallon, was measured for a random sampl ...

Activity 4 - Additional Practice: Gas mileage, in miles per gallon, was measured for a random sample of 9 2019 Canyonero SUV's. It is reasonable to assume that the gas mileage for these SUV's is approximately normally distributed The following are the miles per gallon for each of the 9 SUV's: 16.5, 17.2, 17.1, 17.3, 16.9, 16.7, 17, 17.1, 16.7 1. Construct a 90% confidence interval for the mean gas mileage for the 2019 Canyonero SUV. 2. Please explain why the conditions are met in this problem to construct your confidence interval above. 3. The EPA gas mileage rating for the 2019 Canyonero is 17.3 miles per gallon. Explain whether the rated mileage may be equal to the mean mileage, based on the confidence interval you created above. 4. You want to construct a 90% confidence interval for the population mean gw mileage for the Canyonero that has a margin of error of no larger than 15. How large of a random sample of Canyoneros do you need to take to ensure your margin of error is no larger than 0.157