Measurements of Central Tendency. Statistics vs Parameters. Statistic: A characteristic or measure obtained by using the data values from a sample. Parameter: A characteristic or measure obtained by using all the data values from a population. Notation.
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We are not always given all of the individual data when calculating the mean. Sometimes, we are given a frequency distribution and asked to calculate the mean.
If we have an even number of data in the distribution, find the middle two and add them, then divide by 2, to find the median.
Mode Median Mean