Which of the following is an example of a one-group posttest-only quasi-experimental research design?
A. A researcher records exam scores before and following a new lecture.
B. A researcher records performance on an athletic task following the implementation of a new training technique.
C. A researcher compares body mass index scores for residents in two cities.
D. A researcher compares the speed at which pitchers throw a baseball in the off-season and again during the season.
Answer: B
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