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Author Question: The difference between the group means in a pretest-posttest control group experimental design can ... (Read 129 times)

PhilipSeeMore

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on: Jun 20, 2018
The difference between the group means in a pretest-posttest control group experimental design can be tested for statistical significance most precisely by
 
  a. analysis of variance of the groups' means on the posttest.
  b. separate t-tests of the prepost difference for the experimental and for the control group.
  c. analysis of covariance on the groups' posttest means with pretest as the covariate.
  d. analysis of variance of the mean changes from pre- to posttest for the two groups.

Question 2

Which of the following is not a characteristic of an experiment in its simplest form?
 
  a. A dependent variable is manipulated.
  b. All variables except the independent variable are held constant.
  c. The effect of manipulating the independent variable is observed.
  d. Extraneous variables are controlled.


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choc0chan

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Reply #1 on: Jun 20, 2018
Answer to Question 1

C

Answer to Question 2

A


PhilipSeeMore

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Reply 2 on: Jun 20, 2018
Excellent

Dnite

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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