A consumer organization examined the relationship between the weight of a car ( in thousands of pounds ) and the fuel efficiency ( in Dependent variable is: Fuel Efficiency miles per gallon or mpg ) . Part of the regression analysis is shown to the right, where the response variable is Fuel efficiency. Complete a and b below. R squared = 75.6 % a ) Create a 90 % confidence interval for the average fuel efficiency among cars weighing 2500 pounds, and explain what your interval means. The 90 % confidence interval is , mpg ) . ( Round to two decimal places as needed