PSY201H1 Study Guide - Final Guide: Variance, Standard Deviation, Interpolation
Document Summary
Experimental method: 1 variable is manipulated and another observed. Continuous variable: infinite number of possible values that fall between any two observed values. Interval scale: ordered categories, but that must form intervals of identical size. Interpolation: take the distance from top of interval and divide it by interval width. Subtract the distance you found from the top of the interval of whatever is being measured (i. e. , percent). Each cumulative percentage is associated w/ the real limits. Scores: width = 1 pt. (half = 0. 5 pts) 44%-12% = 32: changing the value of any score will change the mean. The height of a graph should be approx 2/3 to its length. N 1 + n 2: adding/removing a score will change mean, except if score is = to mean, variability is defined in terms of distance. Standard deviation: (cid:214) variance: calculate mean, calculate deviation, square deviations, sum of squares, average of variance, square root of variance.
