Which are characteristics of quasi-experimental research designs that are considered weaknesses, compared with experimental designs? (Select all that apply.)
a. Cost of implementation
b. Confidence in making causal assertions
c. Subject to contamination of internal validity
d. Disruptive to the usual routine of the setting
e. Difficult to perform in a particular clinical setting
f. Findings due to interference of extraneous variables
ANS: B, C, F
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Correct The primary weakness of quasi-experimental designs, compared with experimental designs, is the weakened confidence in making causal assertions.
Quasi-experimental designs are particularly subject to contamination of internal validity by extraneous variables.
Findings of quasi-experimental studies may be due to the influence of extraneous variables, rather than the experimental treatment (independent variable).
Incorrect The costs associated with quasi-experimental designs are generally much lower than the costs of experimental designs.
Quasi-experimental designs are much less disruptive to the usual routine of the setting than experimental designs.
Quasi-experimental designs are easier to perform in a particular clinical setting than experimental designs.
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