Question: Major threats to validity in a pretest & posttest with one experimental group only are: a. History, maturation, main testing, interactive testing, mortality. b. Statistical

Major threats to validity in a pretest & posttest with one experimental group only are:

a. History, maturation, main testing, interactive testing, mortality.

b. Statistical regression, maturation, main testing, interactive testing, mortality.

c. Statistical regression, instrumentation, main testing, interactive testing, mortality.

d. History, instrumentation, main testing, interactive testing, mortality.

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