PSYC 204 Lecture 5: PSYC STAT 5
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/ 50% on either side of median. Values & divide by n # of values. Arithmetic mean definition: numerical average: mean from frequency data - example. = (cid:883)(cid:882)(cid:2873) = 2: mean from data in frequency distribution with class interval = 1. X = value from data f = frequency of data fx = frequency value. Mean = x = = = (cid:886)+(cid:882)+(cid:886)+(cid:884)(cid:2782) = (cid:883)(cid:882)(cid:2873) = 2: mean from data in frequency distribution with class interval not (cid:1005) Raw data = 1, 1, 2, 3, 3, 4, 5, 6, 6, 7, 7, 8, 8, 9. Class interval width of 2 use midpoint of interval xmid = +(cid:2779) (cid:2778)(cid:2781) = (cid:883)(cid:882)+(cid:886)(cid:884)+(cid:883)(cid:888)+(cid:885) (cid:2778)(cid:2781) f = frequency of data fx = frequency value. Because of assumption that all values located in. Sum of deviations from mean = zero x = 0 x = x x .
