A major difference between experimental research and ex post facto research is that
a. in experimental research there are two or more groups of subjects to be compared, while in ex post facto research one group of subjects is being studied.
b. a test of significance is applied to the data collected in an experiment, while descriptive-type statistics are used to analyze data collected in an ex post facto research.
c. in experimental research the researcher is always testing a hypothesis, while in ex post facto research hypothesis testing is not involved.
d. in experimental research manipulation of variables is possible, while in ex post facto it is not possible to manipulate the variables.
Question 2
Choose the internal validity problem that is associated with the situations listed. Presence of the observer increases scores.
a. history
b. maturation
c. experimenter effect
d. statistical regression
e. diffusion
The major classes of vertebrates
Location of major biodiversity hot spots around the world.
(C) Locations of the major veins.
Post-Communist Economies
The experimental system that permits observation of rotation in the F1 component of F1F0 ATP (c)
Major RNA Molecules