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Author Question: What is the purpose for using a control group in an experiment? a. It provides a baseline to ... (Read 47 times)

jace

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on: Jun 19, 2018
What is the purpose for using a control group in an experiment?
 
  a. It provides a baseline to evaluate the size of the treatment effect.
  b. It minimizes the threat of a confounding variable.
 c. It is necessary to ensure the internal validity of the study.
 d. It is necessary to ensure the external validity of the study.

Question 2

In sampling notation, n refers to the ____.
 
  a. number of cases in the sampling frame
  b. number of cases in the population
 c. number of possible units in the sample
  d. sampling fraction


aadams68

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Reply #1 on: Jun 19, 2018
Answer to Question 1

a

Answer to Question 2

c


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