To obtain the average mile per gallon mpg for all new cars a

To obtain the average mile per gallon (mpg) for all new cars, a random sample of 40 new cars was taken which gave an average of 22 mpg.

(hint use words exactly from question text to answer these questions).

(a) Identify the variable ?

(b) Is the variable quantitative or qualitative?

(c) What is the implied population?

Solution

(a). Here the variable is the speed of all new cars in mile per gallon (mpg).

(b). The variable under consideration is quantitative variable as the speed of the car can be measured in numbers and thus it is quantitative.

(c). Here the sample size is 40 which is greater than 30, therefore, considering it to be large sample we can assume the given dataset to follow the Normal distribution.