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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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b) Does there appear to be a linear relationship between the two variables? How would you characterize the relationship?
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The income of employees at a certain company has a normal distribution with a mean of 70140 per year and a standard deviation of 12600 per month. Determine the approximate percentage of employees whose incomes were a. Between 44940 and 95340 per month b.
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A study population of 4,000 newly enrolled students at a university were followed up for four years. Amongst these 4,000 students, 300 were obese at the beginning of their four year programme. At the end of the four year programme, a total of 540 students
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How could you ask someone how many credits they are taking this semester using a ratio level question where zero means none?
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The Bureau of Transportation Statistics Omnibus Household Survey is conducted annually
and serves as an information source for the U.S. Department of Transportation. In one part
of the survey the person being interviewed was asked to respond to the following statement:
"Drivers of motor vehicles should be allowed to talk on a hand-held cell phone while driving." Possible responses were strongly agree, somewhat agree, somewhat disagree, and strongly disagree. Forty-four respondents said that they strongly agree with this statement,130 said that they somewhat agree, 165 said they somewhat disagree, and 741 said they strongly disagree with this statement (Bureau of Transportation website, August 2010$)$ .
a. Do the responses for this statement provide categorical or quantitative data?
b. Would it make more sense to use averages or percentages as a summary of the
responses for this statement?
c. What percentage of respondents strongly agree with allowing drivers of motor vehicles to talk on a hand-held cell phone while driving?
d. Do the results indicate general support for against allowing drivers of motor vehicles to talk on a hand-held cell phone while driving?
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?
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?
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?
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Picturing Variations With Graphs
Linear Regression and Correlation
Normal, Binomial, and Geometric Models