KINE 2050 Lecture Notes - Lecture 8: Normal Distribution, Percentile
8 Apr 2015
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In the example you have 100 subjects and the z-score is 1. 62 which is the 21st o percentile: 250 people. So 21 people would fall under 1. 62 z-score. You multiple 21. 19% with 250 = 52. 975 people. Always round therefore 53 people: essentially you multiple n with the percentage, examples - z-score concept, 1 - a) 50% (simple calculation cause the mean 100, 1 - b) 1. 33 z-score. 50- 40. 82 = 9. 18% population have the iq greater than 120: 2 - answer 13 subjects. Symmetrical curve: third: area from the mean to a particular x, calculate the z-score, examples, first one - area: 0. 1915. In order to answer use the table and look up 0. 1915 in the table. It is negative because it is one the left side of the mean: second one - what is the z-score in the end of the shaded area. Just look up 0. 4750: third one- what is the area of 1. 05.
