Chapter 6, Problem 42E

Drug abuse 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 results are summarized in the following table.

	Percent Who Have Used
Country	Marijuana	Other Drugs
Czech Rep.	22	4
Denmark	17	3
England	40	21
Finland	5	1
Ireland	37	16
Italy	19	8
No. Ireland	23	14
Norway	6	3
Portugal	7	3
Scotland	53	31
United States	34	24

1. a) Create a scatterplot.
2. b) What is the correlation between the percent of teens who have used marijuana and the percent who have used other drugs?
3. c) Write a brief description of the association.
4. d) Do these results confirm that marijuana is a “gateway drug,” that is, that marijuana use leads to the use of other drugs? Explain.