PSY201H5 Lecture Notes - Lecture 6: Normal Distribution, Standard Deviation, Unimodality
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The mean and standard deviation (sd: the mean. How good are hasan"s show"s in general: the sf. Typical amount scores vary, or the av distance from mean. How much do shows vary, on av, from his typical show: is the mean trustworthy. Low sd = most shows will be close to av. High sd = shows will deviate quite a bit from the av. Z -core = the # of standard deviations from the mean a given x value was on the original scale. What if we transformed the entire distribution of original scores: z-score formula. How many sd units the raw score is from the mean. Zero = the mean: mean of z-scores - principle, shape. A z-score is the distance from the mean in sd units z = 0 is the mean --> on original scale. The av deviation from the mean is 0. The sd of z-scores is 1 z = 1 is 1 sd.
