PSYC 204 Lecture 7: PSYC STATS 7
Document Summary
Fxmid= 23764 x = xmid - x x2 = (xmid - x )2 fx fx2. Frequency table with intervals = mean & variance & standard deviation. Z-scores = statistical techniques used to compare sample means to draw inferences about populations. *important to transform scores into standardized units central to inferential statistics. X x = measure of deviation of individual scores from x s = measure of deviation in a sample. Deviation score = how data different from mean. Standard deviation = how data scattered around mean. By dividing by s = can normalize/scale deviation scores into standard deviation units. *change score into z-score normalize into scale with no unit. Ex: x mean = 10 & s standard deviation = 5. If x = 15 = = (cid:2778) (cid:2778)(cid:2777) X is 1 sd standard deviation from x mean. If x = 20 = = (cid:2779)(cid:2777) (cid:2778)(cid:2777) X is 2 sd standard deviation from x mean.
