1. CONSIDER:
A clinical psychologist wants to study the effect of age on mood. Bipolar patients who are clients at the Sheppard Pratt hospital serve as participants. The clinician takes a sample of 30 clients who are 20 years old, and other sample of 30 clients who are 40 years old. She calculates the mean mood rating of each of these groups and compares them between the ages.

1(a). In this example, the independent variable is
1(b). In this example, the dependent variable is.
1(c). Indicate if the mean mood rating is an example of a parameter or statistic?
1(d) Briefly explain your answer for 1(c) above:-
_12
1(e) what type of research method is exemplified in this example?_
1(f). Briefly explain your answer for 1(e)_