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
[{'content': 'P-value is the probability of - \nSelect and explain. \nA. Not rejecting a null hypothesis when true, B. Rejecting a null hypothesis when true, C. Not rejecting a null hypothesis when false, D. Rejecting a null hypothesis when false', 'role': 'user'}, {'content': 'Answer: B \nExplanation: • P-value:\n– Is the ‘Probability of Type I error’ (Null hypothesis is true but rejected)\n– Significance (a) level: is the maximum tolerable probability of Type I error\n– P- value is calculated (on basis of data while Alpha is fixed in advance: by the choice of level of significance\xa0employed in the test\n– P – value calculated can be less than, equal to or greater than alpha (a)\n– Keep Type I error to be minimum (P < a): Then results are declared statistically significant.', 'role': 'assistant'}]