SOC202H1 Lecture Notes - Lecture 3: Quartile, Standard Deviation, Unimodality
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The range (r): the highest score minus the lowest score. Can be used with ordinal or interval-ratio variables. Can be distorted with really high or low score (ex. 5, 10, 10, 15, 20, 250, we should exclude this outlier) 2. I(cid:374)te(cid:396)(cid:395)ua(cid:396)tile (cid:396)a(cid:374)ge (cid:894)iqr(cid:895): (cid:449)hat"s the (cid:396)a(cid:374)ge of the (cid:373)iddle 5(cid:1004)% of the data (cid:894)qua(cid:396)tile (cid:1007) is. 75th percentile, quartile 1 is 25th percentile a score below which a specific percentage of the distribution fails) The median is quartile 2, or the 50th percentile. Any observation falling more than 1. 5 * iqr above the third quartile or below the first quartile. Standard deviation: a measure of the degree of dispersion of the data from the mean. The lowest value possible is 0 (no dispersion) Symbol: standard deviation (s), variance (s2 standard deviation square), sigma is. In theory, there is no upper limit population. Subtract the mean from every score in the distribution 3.
