Biology 2244A/B Chapter Notes - Chapter 2: Interquartile Range, Computational Statistics, Standard Deviation
10 Oct 2016
School
Department
Course
Professor
Document Summary
Chapter 2: describing distributions with numbers (all sections) The most common measure of center is the average or mean. To find the mean of a set of observations, add their values and divide by the number of observations. 2. 2 measuring center: the median (m) the formal version of the midpoint with a specific rule for calculation. Median m is the midpoint of a distribution the number such that half the observations are smaller and the other half larger. To find median: arrange all observations in order of size (smallest to largest, the location is found by counting from the smallest observation using (n+1)/2. If total number of observations(n) is odd, m is the one in the center of the set. If even, median is the mean of the two center observations. Because the mean cannot resist the influence of extreme observations, we say that it is not a resistant measure of center.
