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When physicians or clinical researchers encounter a sample of data, they often try to get an overall picture about the data before proceeding with any analysis. For example, suppose a physician has a group of senior patients who would like their weights under control so that health problems developed by obesity could be minimized. Before the doctor prescribes any medications or gives dietary administration solutions to the patients, she or he might want to know the typical values of these patients' body mass index (BMI), which presents a reliable indicator of body fatness and is commonly used to monitor weight. These single summarized values are called measures of central tendency. A measure of central tendency attempts to describe the distribution of the data by identifying ...

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