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Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
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BallsDeep BallsDeep
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6 years ago
Why would a researcher need to be concerned about the administration of a pretest and posttest in a research study?
 
  a. It is a threat to external validity.
  b. It is a threat to internal validity.
  c. It is a form of selection bias.
  d. It is a form of maturation
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mrperrettimrperretti
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6 years ago
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BallsDeep Author
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6 years ago
Thank you, thank you, thank you!
deathwing
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Yesterday
Helped a lot
smi3
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2 hours ago
This helped my grade so much Perfect
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