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University of North Carolina at Chapel Hill

Oregon State University

Boston College

00:09

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?

09:27

A partial relative frequency distribution is given. a. What is the relative frequency of class $$D ?$$ b. The total sample size is 200 . What is the frequency of class D? c. Show the frequency distribution. d. Show the percent frequency distribution.

02:50

Bryan L.

Consider the data set in Table $1.7 .$ a. Compute the average endowment for the sample. b. Compute the average percentage of applicants admitted. c. What percentage of the schools have NCAA Division III varsity teams? d. What percentage of the schools have a City: Midsiue campus setting?

03:24

The Hawaii Visitors Bureau collects data onvisitons to Haw aii. The following questionswere among 16 asked in a questionnaire handed out to passengers during incoming airline flights. * This trip to Hawaii is my: 1 st, 2 nd, $3 \mathrm{rd},$ 4th, etc. * The primary reason for this trip is: $(10$ categories, including vacation, convention, honeymoon) * Where I plan to stay: $(11$ categories, including hotel, apartment, relatives, camping) Total days in Hawaii a. What is the population being studied? b. Is the use of a questionnaire a good way to reach the population of passengers on incoming airline flights? c. Comment on each of the four questions in terms of whether it will provide categori- cal or quantitative data.

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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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