This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostats, Subject name: Social & Preventive Medicine
Power of study can be increased by: 
Select and explain. 
A. Increasing alpha error, B. Decreasing beta error, C. Decreasing alpha error, D. Increasing beta error
B: Decreasing beta error
Answer: B: Decreasing beta error 
Explanation: -Power of a statistical test can be increased by: 1. Increasing the no. of subjects in a trial (sample size) 2. Reducing beta error (probability of Type II error) 3. Increasing sensitivity