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Temple University

Piedmont College

Boston College

11:40

Mihir N.

The following data show the number of rental cars in service for three rental car companies: Hert. Avis, and Dollar. The data are for the years $2007-2010$ and are in thousands of vehicles (Auto Rental News website, May $15,2011 )$ . a. Construct a time series graph for the years 2007 to 2010 showing the number of rental cars in service for each company. Show the time series for all three companies on the same graph. b. Comment on who appears to be the market share leader and how the market shares are changing over time. c. Construct a bar chart showing rental cars in service for $2010 .$ Is this chart based on cross-sectional or time series data?

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?

01:45

Figure 1.11 provides a bar chart showing the amount of federal spending for the years 2004 to 2010 (Congressional Budget Office website, May $15,2011 ) .$ a. What is the variable of interest? b. Are the data categorical or quantitative? c. Are the data time series or cross-sectional? d. Comment on the trend in federal spending over time.

05:11

The Financial Times/Harris Poll is a monthly online poll of adults from six countries in Europe and the United States. A January poll included 1015 adults in the United States. One of the questions asked was, "How would you rate the Federal Bank in handling the credit problems in the financial markets?" Possible responses were Excellent, Good, Fair, Bad, and Terrible (Harris Interactive website, January $2008 ) .$ a. What was the sample size for this survey? b. Are the data categorical or quantitative? c. Would it make more sense to use averages or percentages as a summary of the data for this question? d. Of the respondents in the United States, 10$\%$ said the Federal Bank is doing a good job. How many individuals provided this response?

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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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