13 Subjects are randomly assigned to four groups Each group

13. Subjects are randomly assigned to four groups. Each group is placed on one of four special diets: a low-fat diet, high-fish diet, combination of low-fat and high-fish diet, and regular diet.   After 6 months, the blood pressures of the groups are compared to see if diet has any effect on blood pressure.

a) Classify this study (circle the answer):    experimental OR observational

b) Identify the independent variable: __________________________________

c) Identify the dependent variable: ___________________________________

14. A researcher finds that people who are more hostile have higher total cholesterol levels than those who are less hostile.

a) Classify this study (circle the answer):    experimental OR observational

b) Identify the independent variable: __________________________________

c) Identify the dependent variable: ___________________________________

Solution

A)

experimental

independent variable : special diets

dependent variable :  the blood pressures

14)

a) observational

b) independent variable : hostile

c) dependent variable : higher total cholesterol levels