The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following condition must be met for a valid student-t test between means of two groups:   (A) Number of observation must be same - no   (B) Standard deviation must be approximately same - no   (C) Mean should be approximately same - no   (D) Sample must be small
['(D) Sample must be small <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Number of observation must be same - no \n (B) Standard deviation must be approximately same - no \n (C) Mean should be approximately same - no \n (D) Sample must be small <> possible answers', '  Which of the following condition must be met for a valid student-t test between means of two groups: <> context@']