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': "Determination of which statistical parameter requires quantities to be arranged in an ascending or descending order's - \nSelect and explain. \nA. Mean, B. Median, C. Mode, D. S.D", 'role': 'user'}, {'content': 'Answer: B \nExplanation: The median \n\nA median is described as the value separating the higher half of a data set from the lower half.\nIt does not depend on the total, and number of items.\nTo obtain the median, the data is first arranged in an ascending or descending order of magnitude, and then the value of the middle observation is located, which is called median.\nFor example, diastolic BP of 9 individuals was as follows -\n\n83, 75, 81, 79, 71, 95, 75, 77, 84\nNow data is arranged in ascending order -\n71, 75, 75, 77, 79, 81, 83, 84, 95\n\nHere, 79 is the middle observation that is separating the upper four values from lower four values, so it is the median.\nIf there are two values in the middle instead of one, the median is worked out by taking the average of the two middle values.\nFor example, If diastolic BP of 10 individuals is as follows :-\n\n83, 75, 81, 79, 71, 95, 75, 77, 84, 90\nData is arranged in ascending order -\n71, 75, 75, 77, 79, 81, 83, 84, 90, 95\n\n\nHere two values are separating the upper half of values from lower half. So the median here is -\n\nMedian = (79 + 81) / 2 = 80\nAdvantage of median\n\nThe value of median is not affected by abnormal very high or very low value.\nTaking the example as was taken in mean -\nThe income of 7 people per day in rupees is as follows\n5, 5, 5, 7,10, 20, 300 = (Total 352)\nHere mean = 50.3\nmedian = 7\nThe value of mean has affected seriously, whereas median is not affected, and median is more nearer to the truth.\nSo, median is used when the distribution of values is skewed (deviated) with some small number of very high values → median is used for skewed distribution.', 'role': 'assistant'}]