2. A random sample of 40 station wagons and minivans sold in the USA in 2018 has been selected and the collisiondamage rating of each vehicle has been recorded. In this sample the average rating is 65 points(the maximal possible rating is 100), and the sample standard deviation is 7.5 points. Create a 95% condence interval for the average rating of all wagons and minivans sold in the USA in 2018. 3. The objective of a study has been to decide whether consumers consider more price or quality. In a poll of 2,000 American adults, 55% claimed that they mainly base their buying decisions on price. (a) Construct a 99% condence interval for the percentage of American adults who base their buying decisions more on price than quality. (b) Suppose that you decrease the condence level from 99% to a smaller probability. How would the left endpoint change ( increase or decrease)? How would the right endpoint change (increase or decrease)