Exhibit 10-10: Identify the Major Threat to Internal Validity in the Following

Multiple Choice

Exhibit 10-10: Identify the major threat to internal validity in the following research studies.
-Refer to Exhibit 10-10.A researcher conducted a semester-long experiment comparing two instructional programs in math.During the administration of tests during the semester, the researcher found that about ten percent of the experimental group and about five percent of the control group were absent for each administration.

A) Regression
B) Diffusion
C) Mortality
D) Selection
E) History