A researcher conducts a study,but has low power to detect an effect.Which of the following is one way in which the research can increase power?
A) make the alpha level smaller
B) increase the sample size
C) study a population with a larger standard deviation
D) conduct the study again with the same sample size

Question

Quizplus · Accepted Answer

Increasing the sample size will increase the power of the study by reducing the variability of the data and making it easier to detect a significant effect. Making the alpha level smaller may decrease the chance of a Type I error, but it does not increase the power of the study. Studying a population with a larger standard deviation may actually decrease the power of the study because it increases the variability of the data. Conducting the study again with the same sample size is not likely to increase power unless there were some modifications made to the study design or analysis.

A Researcher Conducts a Study,but Has Low Power to Detect