Of the following, the design that best controls for internal validity threats is the
A) Posttest only control group design.
B) Pretest-posttest group design.
C) Time series design.
D) Soloman four-group design.

Question

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The Answer of Of the following, the design that best controls for internal validity threats is the
A) Posttest only control group design.
B) Pretest-posttest group design.
C) Time series design.
D) Soloman four-group design.

Of the Following, the Design That Best Controls for Internal