Identify the major threat to internal validity in the following research studies. A teacher researcher randomly assigned students within a classroom to two groups, one of which received some special instructional materials to take home with them to study and to use with homework assignments. The C group did not get the special materials. The researcher was surprised to find that there weren't significant differences between the two groups on achievement tests and other selected measures.
a. Regression
b. Diffusion
c. Mortality
d. Selection
e. History
Ques. 2Identify the kind of correlation appropriate for use in solving each of the following problems. To find the relationship between high school GPA rank and rank on a popularity measure.
a. Pearson's r c. phi coefficient
b. Spearman rho
Ques. 3Identify the major threat to internal validity in the following research studies. A researcher used two classrooms in an experimental study. It was found that the E group had more high ability students than the C group before the study began.
a. Regression
b. Diffusion
c. Mortality
d. Selection bias
e. History
Ques. 4Identify the kind of correlation appropriate for use in solving each of the following problems. To find the relationship between achievement test and intelligence test scores.
a. Pearson's r c. phi coefficient
b. Spearman rho
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