What is the average miles per gallon (mpg) for all new cars? Using Consumer Reports, a random sample of 35 new cars gave an average of 21.1 mpg.
(a) Identify the variable.
new cars
total miles
all cars
miles per gallon
(b) Is the variable quantitative or qualitative?
quantitative
both quantitative and qualitative
qualitative
(c) What is the implied population?
all cars with average miles per gallon
all cars
the 35 new cars that were examined
all new cars
(a) The variable in this scenario is "miles per gallon (mpg)".
(b) The variable is quantitative because it represents a measurement of the average number of miles a car can cover per gallon of fuel.
(c) The implied population in this scenario is "all new cars". The average mpg from the random sample of 35 new cars is used to estimate the average mpg for all new cars.