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redo outline 2 - Chapter 7 The Normal Curve I The Normal...

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Chapter 7 – The Normal Curve I. The Normal Curve a. In essence is a graphic picture the bell-shaped normal distribution. b. Normal distribution: The graph shows most of the scores clustered in the middle around the mean/median/mode, with all the other frequency distributions on either side gradually lessening. II. Characteristics of the Normal Curve a. The curve is bell-shaped and symmetrical. b. The mean, median, and mode are all equal. c. The highest frequency is in the middle of the curve d. The frequency gradually tapers off as the scores approach the ends of the curve. e. The curve approaches, but never meets the abscissa at both the high and low ends. i. Normal curves are used to describe populations and must be open ended to allow for the rare scores that do not fall within three standard deviation units of the mean. f. One standard deviation unit is also equal to a z score of 1.
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i. Ex: When the mean is 100 and S = 16, one standard deviation unit equals 16 points. Thus, one standard deviation above the mean would be equal to the mean PLUS (1 x 16) which is 116, and two standard deviation units below the mean would equal the mean MINUS (2 x 16) which is 68.
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