What is the average miles per gallon (mpg) for all new hybrid small cars? Using Consumer Reports, a random sample of such vehicles gave an average of 35.7 mpg.
(a) Identify the variable. new hybrid small cars miles per gallon total miles all cars
(b) Is the variable quantitative or qualitative? qualitative quantitative both quantitative and qualitative
(c) What is the implied population? the new hybrid cars that were examined all cars all cars with average miles per gallon all new hybrid small cars

a. When we are analizing the variables, we need to see what is the most important factor in this variable. Here we are looking at miles per galon. But the question is specific about new hybrid small cars. So we define the variable as new hybrid small cars miles per galon

b. A qualitative variable is a variable that can't be expressed in numbers. For example when we talk about the colour of a car, that's a qualitative variable. In this problem, we are looking at the consumption of the engine. It's a given number. When we can define measure it with numbers it's a quantitative variable. Therefore this is a quantitative variable

c. The implied population is all the subjects where we are measuring our variable. In here, we are looking at a random sample of all the new hybrid small cars. Since we took a random sample, the idea is that it represents the whole population since we can't measure the consumption on all the new hybrid small cars. Therefore the implied population is all new hybrid small cars