This topic contains a solution. Click here to go to the answer

Author Question: In the randomized, posttest-only, control-group design, external validity is protected by A) ... (Read 73 times)

leo leo

  • Hero Member
  • *****
  • Posts: 566
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



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

josephsuarez

  • Sr. Member
  • ****
  • Posts: 323
Answer to Question 1

Answer: A

Answer to Question 2

Answer: D




leo leo

  • Member
  • Posts: 566
Reply 2 on: Aug 4, 2018
Great answer, keep it coming :)


jackie

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Gracias!

 

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Did you know?

The horizontal fraction bar was introduced by the Arabs.

Did you know?

More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

For a complete list of videos, visit our video library