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Missouri State University

Piedmont College

University of St. Thomas

03:33

Bryan L.

Refer to Table 1.6 . a. What is the average miles per gallon for city driving? b. On average, how much higher is the miles per gallon for highway driving as compared to city driving? c. What percentage of the cars have four-cylinder engines? d. What percentage of the cars use regular fuel?

04:59

Tim S.

The Energy Information Administration of the U.S. Department of Energy provided time series data for the U.S. average price per gallon of conventional regular gasoline between January 2008 and May 2011 (Energy Information Administration website, May $2010 ) .$ Use the Internet to obtain the average price per gallon of conventional regular gasoline since May $2011 .$ a. Extend the graph of the time series shown in Figure 1.1 . b. What interpretations can you make about the average price per gallon of conventional regular gasoline since May 2011$?$ c. Does the time series continue to show a summer increase in the average price per gallon? Explain.

05:43

Mihir N.

The U.S. Department of Energy provides fuel economy information for a variety of motor vehicles. A sample of 10 automobiles is shown in Table 1.6 (Fuel Economy website, February $22,2008 ) .$ Data show the size of the automobile (compact, midsize, or large), the number of cylinders in the engine, the city driving miles per gallon, the highway driving miles per gallon, and the recommended fuel (diesel, premium, or regular). a. How many elements are in this data set? b. How many variables are in this data set? c. Which variables are categorical and which variables are quantitative? d. What type of measurement scale is used for each of the variables?

03:34

J.D. Power and Associates conducts vehicle quality surveys to provide automobile manufacturers with consumer satisfaction information about their products (Vehicle Quality Survey, January 2010 ). Using a sample of vehicle owners from recent vehicle purchase records, the survey asks the owners a variety of questions about their new vehicles, such as those shown below. For each question, state whether the data collected are categorical or quantitative and indicate the measurement scale being used. a. What price did you pay for the vehicle? b. How did you pay for the vehicle? (Cash, Lease, or Finance) c. How likely would you be to recommend this vehicle to a friend? (Definitely Not, Probably Not, Probably Will, and Definitely Will) d. What is the current mileage? e. What is your overall rating of your new vehicle? A 110 -point scale, ranging from I for unacceptable to 10 for truly exceptional, was used.

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Picturing Variations With Graphs

Numerical Summaries

Linear Regression and Correlation

Probability Topics

Normal, Binomial, and Geometric Models

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