Midterm Review Quiz 6

A pre-test of knowledge about computers is given to a group of students 5 minutes prior to a film on the subject. A post test given 10 minutes after the film showed a 10-point gain from the pretest. The research conclused that the film produced the gain. Which of the following is likely the threat to internal validity? Select one: a. testing b. maturation c. statisical regression d. selection bias

a. testing

Interviewers may become more skilled with practice, which could lead to differences between the results of participants interviewed early in the study and those of participants interviewed later. This threat to internal validity is known as Select one: a. statistical regression b. testing c. history d. instrumentation e. None of the above

d. instrumentation

The internal validity of an experimental design is concerned with what question? Select one: a. To what extent can the findings be generalized? b. Did the independent variable really produce a change in the dependent variable? c. How representative is the setting selected for the experiment? d. How will the findings provide information about situations in which variations of the independent variable are present?

b. Did the independent variable really produce a change in the dependent variable?

The one characteristic of true experimental designs that pre-experimental and quasi-experimental designs do not have is Select one: a. the use of a control group b. a pretest and a posttest c. the application of parametric statistics d. random assignment of subject to groups

d. random assignment of subject to groups

In experimental design, when comparisons are made of groups that have been selected on the basis of their extreme scores, the post-test means of the groups tend to move toward the mean of the entire population from which the extreme groups were slected. This threat to internal validity is called... Select one: a. differential selection b. interaction of selection and mortality c. mortality d. statisitical regression e. None of the above

d. statisitical regression