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A survey was conducted in the United States and 10 countries of Western Europe to determine the percentage of teenagers who had used marijuana and other drugs. The data are summarized below the questions and attached as an image as well.
a) Create fitted line plot on percentage of other drugs used vs Marijuana used.
b) What is the correlation coefficient (r) between the percent of teens who have used marijuana and the percent who have used other drugs?
c) Write brief description of the association
d) Do these results confirm that marijuana is a "gateway drug" - that is, that marijuana use leads to the use of other drugs? Explain.
DATA:
Marijuana vs. other Drugs
Country Pct. of Marijuana Pct. of other drugs Czech Rep. 22 4 Denmark 17 3 England 40 21 Finland 5 1 Ireland 37 16 Italy 19 8 North Ireland 23 14 Norway 6 3 Portugal 7 3 Scotland 53 31 United States 34 24
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