STAT-3090 Lecture Notes - Lecture 4: Percentile, Central Tendency, Box Plot
2 Oct 2017
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Form an ordered array by placing the data in order from smallest to largest. In the previous sections, we determined measures of central tendency, which describe a typical. Percentile: order the data, find l: l = 0. 30(24) = 7. 3 this is not an integer so round up to 8, the 8th value in the data set is the 30th percentile value. 8: ans: 1 is the 30th percentile value. approximately 30% of shipments have 1 or fewer defects. Find q1: find l: 0. 25(24) = 6. 6 is an integer, so find the mean of the 6th and the 7th values. Find the mean of the 18th and 19th values. Q3 = (3+4)/2 = 3. 5 c. determine the percentile rank for 3 defects. 18/24 or 75% of the values are at or below 3 defects. Iqr = q3 - q1 = 3. 5 - 1 = 2. 5 defects.
