Section S.1 – Solutions to the Practice Problems

1.

a. The representatives in the state’s congress
b. N = 106
c. n = 28
d. 0.5 or 50%

2.

a. registered voters in Raleigh
b. N = 9500
c. n = 350
d. 0.32 or 32%

3.

a. people with AIDS
b. the 40 AIDS patients who participated in the study
c. mean length of life of all AIDS patients after treatment begins
d. mean length of life of the 40 AIDS patients in the study after treatment begins

4.

a. quantitative
b. qualitative
c. residents using the local park in San Antonio

5. loaded questions

6. sampling bias

7. response bias and perceived lack of anonymity

8. non-response bias

9. loaded questions

10. voluntary response bias

11. observational study

12. experiment

13. observational study

14. experiment

15.

a. group 1
b. group 2 is acting as the control group
c. blind, not enough information to determine if double-blind
d. controlled experiment

16.

a. 2^nd group (those taking the test medicine)
b. 1^st group
c. double-blind
d. placebo controlled experiment