Name:_________________________________________

1. How will you collect your data?

    

    

    

2. What is your alternate plan?

    

    

    

3. Why can't you include only a small number of people in your sample?

    

    

    

4. What problems might occur if you only chose to look for subjects in a trendy cafe?

    

    

    

5. Suppose you collect data on 523 students. If the first percentages given above are correct (25% and 2%), what numbers of students with each type of piercing do you expect?

    

    

    

6. Compare your results with those from the general population that were reported in the magazine study.
   Is the percentage of students with ear piercings significantly different from the variation given in the study in the magazine?

    

    

    

7. Is the fraction of students with body piercings significantly different from the variation given in the study in the magazine?

    

    

    

8. Explain any apparent differences between your new study and the magazine study in terms of possible differences between students and the general population.

    

    

    

9. What new observations could you make that would prove or disprove the existence of the differences you invented in the previous question?

    

    

    

10. What is the percent error in the numbers of piercings in your study?

     

     

     

11. Did your study have better or worse errors than the one the magazine published (that is, is it more or less reliable)?

     

     

     

12. Did the magazine's survey use a larger or smaller sample than yours?