Identify the major threat to internal validity in the following research studies. 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
C
You might also like to view...
Due to denial, many parents of infants with disabilities go from physician to physician "shopping" for an optimistic diagnosis
Indicate whether the statement is true or false
Paraphrasing involves:
a. Putting the information into your own words b. Summarizing the idea of another person c. Citing the source d. All of these statements are true
One strategy for ?raising your grades is to simply get more sleep
Indicate whether the statement is true or false
The Americans with Disabilities Act of 1990
a. Led companies to hire only disabled applicants b. Led companies to keep separate medical and employment files c. Led companies to take affirmative action related to hiring those with disabilities d. None of the above