The experimenter effect as an internal validity threat is concerned most directly with
a. matching.
b. novelty.
c. expectations.
d. compensation.
e. selection interaction.
Ques. 2A lack of original equivalency between two preexisting groups can be partly compensated for by using a pretest, posttest, and a/an
a. analysis of covariance.
c. factorial design.
b. analysis of variance.
d. randomization procedure.
Ques. 3The major benefit of random assignment is it
a. reduces the plausibility of alternative explanations for the observed effects.
b. makes it possible to observe the effects of an independent variable on another variable.
c. ensures that the sample chosen for a study is similar to the population from which the sample was drawn.
d. equates the groups before the experimental treatment begins.
e. a and d
Ques. 4Counterbalancing is a technique that controls for
a. lack of random assignment.
b. failure to use a double blind technique.
c. experimenter effect.
d. order and carryover effects.
e. diffusion.
Ques. 5Consider the following: To what group of subjects can the research results based on this particular sample be generalized? This question is concerned with
a. selection-maturation interaction.
b. reactive effect.
c. internal validity.
d. experimenter effect.
e. external validity.
Ques. 6If a researcher makes a generalization from a study about apes to a human population, what type of validity problem might he/she have?
a. Internal
b. External
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