Prior to initiating a research study,a researcher conducts a power analysis to determine the sample size necessary for a power level of 0.8 and an alpha of .05.The researcher will:
A) apply a quota sampling technique to improve generalizability.
B) decrease the sample size to minimize costs.
C) increase the sample size to avoid a Type II error.
D) use stratified random sampling to minimize error.

Question

Quizplus · Accepted Answer

Conducting a power analysis helps the researcher to determine the sample size required to achieve a power level of 0.8 (which means the study has an 80% chance of detecting a true effect) and an alpha of 0.05 (the probability of making a Type I error). Increasing the sample size is meant to avoid a Type II error, which is the probability of failing to detect a true effect. Therefore, the best choice is to increase the sample size to ensure a sufficient level of power for the study. A quota sampling technique, decreasing the sample size, or using stratified random sampling are unrelated to power analysis and sample size determination.

Prior to Initiating a Research Study,a Researcher Conducts a Power