Statistical Sciences 2244A/B Lecture Notes - Lecture 3: Standard Deviation, Percentile, Unimodality
27 Sep 2016
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Document Summary
Mean - the central or typical value of a data set. Mean = sum of all values / # of values. Median - midpoint value, separating the lower half and upper half of a data set. The median m is the midpoint of a distribution, the number such that half the observations are smaller and the other half are larger. Arrange all observations in order of size, from smallest to largest. If the number of observations n is odd, the median m is the center observation in the ordered list. Find the location of the median by counting (n + 1)/2 observations up from the smallest observation in the list. If the number of observations n is even, the median m is the mean of the two center observations in the ordered list. The location of the median is again ( n + 1)/2, counting from the smallest observation in the list.
