One way of providing some control in ex post facto research is
a. to use analysis of covariance.
b. to do a pilot study before carrying out the main research.
c. to match the subjects of the groups to be compared on as many extraneous variables as possible.
d. a and b
e. a and c
Ques. 2Choose the term that is described in each of the phrases below. Removes the part of each subject's posttest score that is in common with his/her pretest score.
a. random assignment
b. randomized matching
c. homogeneous selection
d. analysis of covariance
e. use of subjects as their own controls
Ques. 3A researcher obtains chemistry achievement test scores from a group of high school students who have had laboratory experience and a group who have not. She recognizes the need to control for the variable intelligence in his study. Identify the type of control technique illustrated by the following procedures. The effect of intelligence on the test scores is controlled with a statistical procedure.
a. match
b. use analysis of covariance
c. use a homogeneous group
d. add intelligence as an additional independent variable
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