Biology 2244A/B Chapter Notes - Chapter 2: Dependent And Independent Variables, Confounding, Observation Arc
5 Nov 2016
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The most common measure of center is the ordinary arithmetic average or mean. The median m is the midpoint of a distribution, the number such that half the observations are smaller and the other half are larger. To obtain it: 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. ** the formula (n+1)/2 does not give the median it just points at the median in the ordered list. The mean is the central (or typical) value of a dataset: sum of all values/#values. The median, first sort the points from lowest to highest. The midpoint value, separating the lower half and upper half of a dataset. Skewed side is the one where the tail is. Range: difference between maximum and minimum values in a spread.
