A researcher wants to investigate the effectiveness of three versions of a computer-assisted instructional (CAI) program in math on the achievement of elementary school students in math. The researcher wants to know if the effectiveness of the program would depend on the math aptitude (classified as above and below average) and the gender of the students. What experimental design would you recommend for this study?
a. 1 x 2 x 3 factorial design
b. 3 x 2 x 2 factorial design
c. Solomon three-group design
d. Randomized subjects, pretest-posttest, control group design
e. None of these is true.
Question 2
In an experiment, a researcher believes that by manipulating Variable A he can cause changes in Variable B. However, Variable C is actually causing changes in Variable B. Variable C is a(n) ____ variable.
a. independent c. extraneous
b. dependent d. attribute
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