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
The control of breathing via respiratory centres in the mammalian brain.
endocrine feedback control
Michelangelo, Study for the Libyan Sibyl.
Juvenile buzzard being weighed for research
Baltimore Longitudinal Study of Aging
Study Tips