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Do rock music CDs and country music CDs give the consumers the same amount of music listening time? A sample of 12 randomly selected single rock music CDs and a sample of 14 randomly selected single country music CDs have the following total lengths (in m
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In a recent. Zhao and colleagues measured the levels of formaldehyde in the air in 34 classrooms in the schools in the city of Taiyuan, China. On the same day, they gave questionnaires to 1993 students aged 11-15 in those schools, asking them whether the
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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
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?
The top four prime-time television shows were Law \& Order, CSI, Without a Trace, and Desperate Housewives (Nielsen Media Research, January $$1,2007$$ ). Data indicating the
preferred shows for a sample of 50 viewers follow,
A random telephone survey of 1021 adults (aged 18 and older) was conducted by Opinion
Research Corporation on behalf of Completetax, an online tax preparation and e-filing
service. The survey results showed that 684 of those surveyed planned to file their taxes
electronically (CompleteTax Tax Prep Survey 2010 ).
a. Develop a descriptive statistic that can be used to estimate the percentage of all
taxpayers who file electronically.
b. The survey reported that the most frequently used method for preparing the tax retumis to hire an accountant or professional tax preparer. If 60$\%$ of the people surveyed had
their tax return prepared this way, how many people used an accountant or professional
c. Other methods that the person filing the retum often used include manual preparation,
use of an online tax service, and use of a software tax program. Would the data for the method for preparing the tax return be considered categorical or quantitative?
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Picturing Variations With Graphs
Linear Regression and Correlation
Normal, Binomial, and Geometric Models