Author Question: A nurse researcher assigns subjects to experimental and control groups in such a manner that each ... (Read 83 times)

abern · **on:** Jul 8, 2018

A nurse researcher assigns subjects to experimental and control groups in such a manner that each subject in a population has an equal chance of being selected. What is the researcher using?

a. Selection bias
b. Convenience sampling
c. Randomization
d. Internal validity

Question 2

For which of these reasons would a nurse researcher choose to assign subjects randomly to groups in a study?

a. To help ensure that all groups within a study are representative of the larger population
b. To increase the chance that the study groups will be different from each other with regard to extraneous variables
c. To help ensure that current events do not influence the outcomes of the study
d. To eliminate the need for establishing specific study criteria and subject eligibility

akpaschal · **Reply #1 on:** Jul 8, 2018

Answer to Question 1

ANS: C

Feedback
A Selection bias occurs when precautions are not used to gain a representative sample.
B Convenience sampling refers to the sampling method in which subjects who are available are used. These subjects do not necessarily represent the population.
C Randomization is the process of obtaining subjects so that each has an equal chance of being selected for experimental or control groups.
D Internal validity refers to confidence that the independent variable made the difference in the dependent variable, not some extraneous, intervening variable.

Answer to Question 2

ANS: A

Feedback
A The purpose of randomization is to help ensure that subjects in the study's groups represent the larger population.
B Randomization helps to ensure that study groups will be approximately equal, not different with regard to extraneous variables.
C Randomization cannot control current historical events.
D Randomization does not eliminate the need for study criteria and subject eligibility factors.