Intro STATS, Books a la Carte Plus New Mystatlab with Pearson Etext -- Access Card Package
Intro STATS, Books a la Carte Plus New Mystatlab with Pearson Etext -- Access Card Package
4th Edition
ISBN: 9780321869852
Author: Richard D. De Veaux
Publisher: PEARSON
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Chapter 1, Problem 30E

(Exercises 27–40) 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).

36. 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.

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Cellulon, a manufacturer of home insulation, wants to develop guidelines for builders and consumers on how the thickness of the insulation in the attic of a home and the outdoor temperature affect natural gas consumption. In the laboratory, it varied the insulation thickness and temperature. A few of the findings are: Monthly Natural Gas Consumption (cubic feet), Y Thickness of Insulation (inches), X1 Outdoor Temperature (°F), X2 30.3 6 40 26.9 12 40 22.1 8 49 How much natural gas can homeowners expect to use per month if they install 6 inches of insulation and the outdoor temperature is 40 degrees F? Group of answer choices 36.69 cubic feet 30.30 cubic feet 30.89 cubic feet 33.69 cubic feet
The table shows the number of accidents, fatalities, hours and miles flew for U.S. airlines.                   Year Accidents  Fatalities Hours flown Miles flown 2000    59         98 16.7 million 7.1 billions 2005    36         28 18.7 7.8         2010    29           0 17.2 7.3 2015    25           0 17.4 7.6   a. Compute the accident rate per million hours flown in 2000 and 2015.  By this measure, has travel on U.S. airlines become safer? b. Compute the accident rate per billion miles flown in 2000 and 2015.  By this measure, has travel on U.S. airlines become safer?
For each description of data, identify theW’s, name the variables, specify for each variable whether itsuse indicates that it should be treated as categorical or quantitative, and, for any quantitative variable, identify the units inwhich it was measured (or note that they were not provided) . Streams In performing research for an ecology class, students at a college in upstate New York collect data on localstreams each year. They record a number of biological, chemical, and physical variables, including the streamname, the substrate of the stream (limestone, shale, ormixed), the acidity of the water (pH), the temperature (°C),and the BCI (a numerical measure of biological diversity).

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Intro STATS, Books a la Carte Plus New Mystatlab with Pearson Etext -- Access Card Package

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