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Author Question: In the randomized, posttest-only, control-group design, external validity is protected by A) ... (Read 37 times)

leo leo

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on: Aug 4, 2018
In the randomized, posttest-only, control-group design, external validity is protected by
 
  A) random selection of the sample.
  B) random assignment of participants to groups.
  C) use of a control group.
  D) None of the above

Question 2

In order to test the effects of the 1988 heat wave on worker productivity, 48 machinists were randomly assigned to two groups of 24 machinists each.
 
  Each group was tested at a different room temperature (cool and hot) using dependent measures of number of parts produced and accuracy. What type of design does this study represent?
 
  A) a single-group, pretest-posttest design
  B) a Solomon four-group design
  C) a multilevel, completely randomized, between-subjects design
  D) a randomized, posttest-only, control-group design


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josephsuarez

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Reply #1 on: Aug 4, 2018
Answer to Question 1

Answer: A

Answer to Question 2

Answer: D


leo leo

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Reply 2 on: Aug 4, 2018
Gracias!

ktidd

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Reply 3 on: Yesterday
Excellent

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