Subject: Statistic (CC 313)

I. American Culture and Drug Abuse

Assume you are a member of the Family Research Council and have become increasingly concerned about the drug use by professional sports players. You set up a plan and conduct a survey on how people believe the American culture (television, movies, magazines, and popular music) influences illegal drug use. Your survey consists of 2250 adults and adolescents from around the country. A consumer group petitions you for more information about your survey. Answer the following questions about your survey.

1. What type of survey did you use (phone, mail, or interview)? Why?

2. What are the advantages and disadvantages of the surveying methods you did not use?

3. Did you use probability or non-probability sampling method for deciding who would be in your sample? Why?

4. Which of the methods (simple random, stratified, systematic, cluster, convenience, purposive or quota) did you use? Why?

5. Why was that method more appropriate for this type of data collection and not the other methods?

6. If a convenience sample were obtained, consisting of only adolescents, how would the results of the study be affected?

II. Using the Slovin's formula, determine the sample size given the population and the margin of error (e).

1. N = 800 ; e = 2%

2. N = 2,000 ; e = 3%

3. N = 10,000 ; e = 5%

4. N = 50,000 ; e = 7.5%