The following are multiple choice questions (with answers) about medical knowledge.   **Question:** You have been asked to design a study for a disease whose prevalence in the community is 10%. The alpha error has to be kept at 5% with a relative precision of 20% and a power of 20%. What will be the accurate sample size for this study?   (A) 400   (B) 900   (C) 1800   (D) 3600
['(B) 900 <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 400 \n (B) 900 \n (C) 1800 \n (D) 3600 <> possible answers', '  You have been asked to design a study for a disease whose prevalence in the community is 10%. The alpha error has to be kept at 5% with a relative precision of 20% and a power of 20%. What will be the accurate sample size for this study? <> context@']