The most acute problem with extraneous sources of variation is that
A) they are next to impossible to eliminate or adjust the results for.
B) they do not allow the experimenter to conclude that the observed response was due to experimental manipulations.
C) we do not know whether or not they have operated.
D) they always work in a negative direction.
E) they can only be eliminated by randomization and matching
Correct Answer:
Verified
Q29: If there is no way of certifying
Q30: What are the two main ways in
Q31: If there are two groups at issue,
Q32: In general, matching is the preferred procedure
Q33: If a subject forgets to show up
Q35: The three common types of experimental designs
Q36: Which of the following is TRUE?
A) In
Q37: A single group of test units is
Q38: The one-group pretest-posttest design
A) can be diagrammed:
Q39: The difference, 02 - 01, in the
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