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Of the following experimental designs, the one that is weakest in internal validity is the a. one-group pretest-posttest design. b. posttest-only control-group design. c. pretest-posttest

Of the following experimental designs, the one that is weakest in internal validity is the

a. one-group pretest-posttest design.

b. posttest-only control-group design.

c. pretest-posttest control-group design.

d. time-series design.

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