This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: In the randomized, posttest-only, control-group design, external validity is protected by A) ... (Read 24 times)

leo leo

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


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

Answer: A

Answer to Question 2

Answer: D


leo leo

  • Member
  • Posts: 566
Reply 2 on: Aug 4, 2018
:D TYSM

Sarahjh

  • Member
  • Posts: 370
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Genetic control of eye evolution. Genetic control of eye evolution.
Control of Secretion of Stress Hormones Control of Secretion of Stress Hormones
Blood Group Identification by Antigen and Antibody Blood Group Identification by Antigen and Antibody
Use an Automated External Defibrillator Use an Automated External Defibrillator
The experimental design and results of Lester and Gorzalka (1988). On the third test, the female ... The experimental design and results of Lester and Gorzalka (1988). On the third test, the female ...
GDP per Capita by Country Group, 1820–2008 GDP per Capita by Country Group, 1820–2008
Video: Hydrogen bonds - role in the body

For a complete list of videos, visit our video library