The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 1-46414-253-X
ISBN 13: 978-1-46414-253-6

Chapter 1 - Picturing Distributions with Graphs - Apply Your Knowledge: 1.1b


Variables: Vehicle Class, Transmission Type, Number of Cylinders, City mpg, Highway mpg, Annual Fuel Cost Categorical variables: Vehicle Class, Transmission Type Quantitative variables: Number of Cylinders, City mpg, Highway mpg, Annual Fuel Cost Number of cylinders is measured in cylinders. City mpg and Highway mpg are measured in miles. Annual Fuel Cost is measured in dollars ($).

Work Step by Step

A categorical variable places the individuals of a dataset into one of several groups or categories. In this dataset, for example, Transmission Type classifies the vehicles into two groups: vehicles with an automatic transmission and vehicles with a manual transmission. A quantitative variable takes numerical values that we can use to perform arithmetic operations such as adding or averaging. In this dataset, for example, Annual Fuel Cost provides an estimate of how much it would it would cost to buy fuel for each vehicle in a given year. We can use the value associated with each vehicle to find an average fuel cost for all vehicles in the dataset.
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