A teacher wanted to evaluate the efficacy of a new technique for teaching comprehension skills to her class of learning disabled students. She administered a comprehension test before introducing the new technique. At the end of the semester, she administered the test again and compared the results from the two tests. This study is an example of which of the following?

a) Factorial experimental design
b) Nonequivalent-groups pretest-posttest design
c) Randomized-groups pretest-posttest design
d) Single-group pretest-posttest design


d

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