(Exercises 21-34) For each description of data, identify the W\'s, name the vari
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(Exercises 21-34) For each description of data, identify the W's, name the variables, specify for each variable whether its use indicates that it should be treated as categorical or quantitative, and, for any quantitative variable, identify the units in which it was measured (or note that they were not provided) 30. Fuel economy The Environmental Protection Agency (EPA) tracks fuel economy of automobiles based on in- formation from the manufacturers (Ford, Toyota, etc.). Among the data the agency collects are the manufacturer, vehicle type (car, SUV, etc.), weight, horsepower, and gas mileage (mpg) for city and highway driving.Explanation / Answer
To track the fuel economy of automobiles is the objective of the study.
The Environmental Protection Agency (EPA) collects manufacturer of the automobiles, vehicle type, weight, horsepower, and gas mileage for city and highway driving.
What: Manufacturer of the automobiles, vehicle type, weight, horsepower, and gas mileage for city and highway driving.
Who: All automobiles under study.
Where: United States.
When: Current period.
Why: To track the fuel economy of automobiles.
Variables:
Manufactuer: Categorical variable (Ford, Toyota, etc.)
Vehicle Type: Catergorical variable (car, SUV, etc.)
Weight: Quantitative variable, Units: Not specified.
Horsepower: Quantitative variable, Units: Not specified.
Gas mileage: Quantitative variable, Units: mpg
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