Drug abuse revisited Chapter 6, Exercise 42 examines results of a survey conducted in the United States and 10 countries of Western Europe to determine the percentage of teenagers who had used marijuana and other drugs. Below is the
- a) Do you think a linear model is appropriate? Explain.
- b) For this regression, R2 is 87.3%. Interpret this statistic in this context.
- c) Write the equation you would use to estimate the percentage of teens who use other drugs from the percentage who have used marijuana.
- d) Explain in context what the slope of this line means.
- e) Do these results confirm that marijuana is a “gateway drug,” that is, that marijuana use leads to the use of other drugs?
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