Drug abuse. In the exercises of the last chapter you

Chapter 8, Problem 42

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Drug abuse. In the exercises of the last chapter you ex-amined results of a survey conducted in the United Statesand 10 countries of Western Europe to determine the percentage of teenagers who had used marijuana andother drugs. Below is the scatterplot. Summary statisticsshowed that the mean percent that had used marijuanawas 23.9%, with a standard deviation of 15.6%. An aver-age of 11.6% of teens had used other drugs, with a stan-dard deviation of 10.2%. a) Do you think a linear model is appropriate? Explain.b) For this regression, is 87.3%. Interpret this statisticin this context.c) Write the equation you would use to estimate thepercentage of teens who use other drugs from thepercentage who have used marijuana.d) Explain in context what the slope of this line means.e) Do these results confirm that marijuana is a gatewaydrug, that is, that marijuana use leads to the use ofother drugs?

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