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1. Worlds Busiest Airports A study of the worlds busiest airports was conducted by Airports Council International. Describe three variables that one could use to determine which airports are the busiest. What units would one use to measure these variables? Are these variables categorical, discrete, or continuous?

2. Smoking and Criminal Behavior The results of a study published in Archives of General Psychiatry stated that male children born to women who smoke during pregnancy run a risk of violent and criminal behavior that lasts into adulthood. The results of this study were challenged by some people in the media. Give several reasons why the results of this study would be challenged.

3. Piano Lessons Improve Math Ability The results of a study published in Neurological Research stated that second-graders who took piano lessons and played a computer math game more readily grasped math problems in fractions and proportions than a similar group who took an English class and played the same math game. What type of inferential study was this? Give several reasons why the piano lessons could improve a students math ability.

4. ACL Tears in Collegiate Soccer Players A study of 2958 collegiate soccer players showed that in

46 anterior cruciate ligament (ACL) tears, 36 were in women. Calculate the percentages of tears for each gender.

a. Can it be concluded that female athletes tear their knees more often than male athletes?

b. Comment on how this studys conclusion might have been reached.

5. Anger and Snap Judgments Read the article entitled Anger Can Cause Snap Judgments and answer the following questions.

a. Is the study experimental or observational? b. What is the independent variable? c. What is the dependent variable? d. Do you think the sample sizes are large enough to

merit the conclusion? e. Based on the results of the study, what changes

would you recommend to persons to help them reduce their anger?

6. Hostile Children Fight Unemployment Read the article entitled Hostile Children Fight Unemployment and answer the following questions.

a. Is the study experimental or observational? b. What is the independent variable? c. What is the dependent variable? d. Suggest some confounding variables that may have

influenced the results of the study. e. Identify the three groups of subjects used in thestudy.