STAT 2507 Lecture Notes - Lecture 2: Box Plot
20 Jan 2015
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Tchebycheff"s theorem: choose any k (in this example its 2 or 3) it means that 3/4 or 8/9 of your measuremeants are between mean - 2s and mean + 2s examples page 3. 2 prportion in intervals tchebysheff empirical at least 0 0. 68. 31/50 = 0. 62: yes, no for k=1 we need . 68 but we got . 62 and son on, data is slightly skewed. 2. m = 12. 8 s = 1. 7 empirical. 95% of the workers complete the job between 9. 4 and 16. 2. 5% are of the corners of the graph 2. 5% on each side. 2. 5% do it in less than 9. 4 and 2. 5% do it longer than 16. 2 example page 4 n = 18. = 74. 25 - 65 = 9. 25 to draw a boxplot draw a box that starts from q1 to q3 draw a line in the box that indicates the median. Po. q1 = 0. 25(12) = 3rd position => 22.
