STAT 203 Midterm: STAT203 Midterm 1 Solution
24 Oct 2018
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Your solutions should be presented in a legible and logical form. Do not skip steps in your solutions or fail to describe what you are doing. 1. (a) [4] following are four true or false questions. T or f (ans= t: the range of the data is always greater than the average absolute deviation. T or f (ans= t: explain the di erence between nominal and ordinal data. 2. (a) [7] do all the calculations for part (a) using the grouped frequency distribution depicted below. Do not forget to explain how you obtain your answers: 100 = 47. 62: obtain the mode, median and mean. mode=midpoint of interval with largest frequency = midpoint of [1. 5 2. 0) = (1. 5 + 2. 0)/2 = 1. 75. (cid:195) (cid:33) i median = l + N/2 cfb f where the c. i. =critical interval is [2. 0 2. 5) since it contains the (n + 1)/2 = (21 + 1)/2 = 11th largest observation.
