1. The following research studies consist of two or more groups of scores being compared. For each, decide whether the study is experimental or nonexperimental, and then identify the dependent, independent, or quasi-independent variables.A researcher would like to find out more about the determinants of college achievement. He conducts a study on 437 college students in which he measures their IQ levels and their grades in college courses. The researcher created five different groups using the students' IQ levels and then compared the average grades among members in different groups.

This study is an example of an experimental or non experimental study.

IQ group assignment is the quasi-independent, dependent or independent variable. The grades of the college students is the quasi-independent, dependent or independentvariable.

2. Researchers at a medical school conducted a study to test the effectiveness of a new drug for lowering cholesterol. The 52 subjects who volunteered for the study were each given a randomly generated number. Subjects with an odd number were given the new drug, while those with an even number were given a placebo. Cholesterol levels before and after the treatment were measured for each subject, and the differences were computed.

This study is an example of an experimental or non experimentalstudy.

The difference in cholesterol level is the quasi-independent, dependent or independent variable. The treatment with drug or placebo is the quasi-independent, dependent or independent variable.