If a research team increases the sample size for a study, the power of their statistical tests will:

a) stay the same,

b) decrease,

c) increase

Answer: c) increase

Step-by-step explanation:

A sample is a finite subset of the entire population on which research statistical test regarding his / her objective.

As the sample size increases it comes closer to the population size, and so converge to a better result of researcher's analysis.

It means the size of the sample is proportional to the power of their statistical tests.

∴ As the size of the sample increases the power of statistical test increases.

Hence, If a research team increases the sample size for a study, the power of their statistical tests will increases.

Therefore, the correct answer is : c) increase