PSYC 2021 Lecture Notes - Kurtosis, Interpolation, Percentile
22 Dec 2013
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Characteristics: the number if peaks it has. 1 peak-unimodel, 2 peaks-bimodel, many peaks-multimodel, flat-uniform. The shape of normal distribution is mesokurtic. Leptokurtic distribution is long and narrow, while platykuric distribution is flat. Percentile you are given area (as a %) and asked to find the score. Percentile rank you are given the score and asked to find the area (% associated with that. In a table you can go from the score column to the percentile column and vice cersa. score) Ex: find 50th percentile (using chart above): 7 (7. 5 is upper limit: 65% - 30%= 35, 65% - 50% = 15, 8. 5 7. 5 = 1, 15/35=0. 43, 0. 43 x 1 = 0. 43, 8. 5 0. 43 = 8. 07. Therefore, the score at the 50th percentile is 8. 07. Clicker: 7. 655, when rounded to two decimal places is 7. 66. When number ends in a 5", you round up or down depending on what gives you an even number.
