To detect a significant difference between two groups when the ...

[tichca]

To detect a significant difference between two groups when the effect size is small, what should the researcher do?
 
  a. Conduct a pilot study.
  b. Obtain a different sample.
  c. Increase the sample size.
  d. Perform additional analysis.

Question 2

Apart from sample size, which of the following is typically not considered when determining the power of a study?
 
  a. Sensitivity of the instruments used
  b. Number of variables
  c. Skill of the researcher
  d. Data analysis techniques

[joshraies]

Answer to Question 1

ANS: C
Increasing the sample size makes it easier to detect a difference.
A pilot study will help iron out problems with the methodology, but would not change the effect size.
Obtaining a different sample would not change the effect size.
Additional analysis would not change the effect size.

Answer to Question 2

ANS: C
The skill of the researcher does not affect the statistical power of a study. All other answers are correct.
Sensitivity of the instruments used is typically considered when determining the power of a study.
The number of variables is typically considered when determining the power of a study.
Data analysis techniques are typically considered when determining the power of a study.