Intro Stats (4th edition) For each description of data, identify the W’s, name t

Question

Intro Stats (4th edition)

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 unit in which it was measured (or note that they were not provided).

Fuel economy: The Environmental Protection Agency (EPA) tracks fuel economy of automobiles based on information 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

A categorical variable doesn’t have numerical or quantitative meaning but simply describes a quality or characteristic of something.

The numbers used in categorical or qualitative data designate a quality rather than a measurement or quantity. For example, you can assign the number 1 to a person who’s married and the number 2 to a person who isn’t married. The numbers themselves don’t have meaning — that is, you wouldn’t add the numbers together.

QUANTITATIVE VARIABLES

Quantitative variables are measured and expressed numerically, have numeric meaning, and can be used in calculations.

Hence here

Manufacturer is the catogorical

Vehical type is also catogorical

Above three varible are not express in numberical quantity hence they are qualitative or catogorical variable

Weight,horsepower, gas nilage are quantitative variables because they can express in number

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