When we are not sure that the obtained result of an experimental study is really attributable to our manipulation of the independent variable, we are questioning the __________ of the study.
a. generalizability
b. external validity
c. internal validity
d. correlational nature
Question 2
A major advantage of within-group experimental designs is that they
a. require fewer participants than between-groups designs.
b. are more valid than between-groups designs.
c. allow for higher numbers of participants than between-groups designs.
d. are more flexible than between-groups designs.
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