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Smoking 2004.
The Centers for Disease Control and Prevention track cigarette smoking in the United States. How has the percentage of people who smoke changed since the danger became clear during the last half of the 20th century? The scatterplot shows percentages of smokers among men 18 - 24 years of age, as estimated by surveys, from 1965 through 2004. (www.cdc.gov/nchs/)
a) Do you think there is a clear pattern? Describe the trend.
b) Is the association strong?
c) Is a linear model appropriate for these data? Explain.
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you want to compare the daily sales for two different designs of web pages for your internet business. you assign the
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