This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Power of a study can be increased by - 
Select and explain. 
A. Increasing α error, B. Decreasing β-error, C. Decreasing α error, D. Increasing β error
B: Decreasing β-error
Answer: B: Decreasing β-error 
Explanation: None