input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A statistical test which indicates the chance or probability of an observed difference between two means occurring by chance is called,   (A) Tests of significance   (B) Means   (C) Ratio   (D) Normalcy
output: ['(A) Tests of significance <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Tests of significance  (B) Means  (C) Ratio  (D) Normalcy <> possible answers', '  A statistical test which indicates the chance or probability of an observed difference between two means occurring by chance is called, <> context']