To achieve partial control in ex post facto research, the researcher can
a. conduct a pilot study to determine a common cause.
b. match subjects on as many extraneous variables as possible.
c. randomly assign subjects to experimental and control groups.
d. b and c
Question 2
Identify the threats to internal validity illustrated in the example below. Some students left the experimental program because of a conflict with sports.
a. Instrumentation
b. Experimental mortality
c. Selection-maturation interaction
d. Statistical regression
e. Diffusion
Water striders serve as a model organism for the study of sexual conflict between males and females.
Berko’s Language Study
Control of glycogen synthase activity
Baltimore Longitudinal Study of Aging
Transmission genetics began with the study of pea plants.
Example of gene control in bacteria