SOCI301 Lecture 6: Soci Lecture 6
6 Apr 2016
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Measure of central tendency=a single or few values that summarize the info of a variable (ex: gpa, unemployment rate) measured through mean, median, mode. Mean: the arithmetic average of a continuous variable"s scores (y=y1+y2+yn/n). Mode: the value that appears most often. Ex: the modal # of children per fam-2. Median: the value that appears exactly halfway of all observations that fall above that point. It is the value at which the cumulative percentages reach. To compute median: arrange observations in order of size from lowest to highest. Ex: 5, 8, 10 n is odd, so middle number/median is 8. 5, 8, 10, 15 n is even, so middle #/median is 9. If n (# of observations) is odd, the median is middle observation. If n is even, the median is the mean of the middle 2 observations. Outliers=the implication of outliers/extreme values for the mean (most strongly influenced), median &mode. Ex: 2, 2, 5 mean: 3 median:2 mode:2.
