. Which of the following is an example of a one-group pretest–posttest quasi-experimental research design?

A. A researcher records how loud patrons are (in decibels) during an interview immediately after listening to loud music.
B. A researcher records the number of chin-ups a group of children can complete prior to giving a treatment aimed at improving physical fitness.
C. A researcher measures health statistics in two cities with comparable demographics.
D. A researcher records amount consumed in a meal before and after an instructional video on the benefits of eating healthy.


Ans: D

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