After completing the power analysis the researchers determine they need a sample size of 400 to have adequate power in their study. After enrolling subjects they have a lower response rate than anticipated and they only enroll 320. Inadequate enrollment may increase the risk of:
A) Systemic bias
B) A type I error
C) A type II error
D) Statistical Significance

Question

Quizplus · Accepted Answer

A lower sample size than required reduces the study's power, increasing the risk of a Type II error, which is failing to detect an effect that is present.

After Completing the Power Analysis the Researchers Determine They Need