Introductory Statistics 9th Edition

Published by Wiley
ISBN 10: 1-11905-571-7
ISBN 13: 978-1-11905-571-6

Chapter 3 - Section 3.6 - Box-and-Whisker Plot - Exercises - Page 115: 3.78

Answer

The distribution of these data skewed to the left. The outlier 2199 is a mild outlier.

Work Step by Step

The distribution of these data skewed to the left, because the median is to the right of the center of the box. The ranked data in increasing order is as follows: 427,441,530,595,699,716,872,933,934,1046,1065,1125,1127,1187,1234,1274,1353,1480,1630,2199 Median = (146+1065)/2 = 1055.5 Q1=699 Q3=1274 IQR= Q3-Q1 = (1274-699) = 575 To find the lower and upper inner fences, 1.5*IQR= (1.5*575) = 862.5 Lower inner fence = (Q1-862.5) = 699-862.5 = -163.5 Upper inner fence= (Q3+862.5) = 1274+862.5 =2136.5 Smallest value within the two inner fences = 427 Largest value within the two inner fences =1630 To find the lower and upper outer fences, 3*575 = 1725 Lower outer fence =(Q1-1725)= (699-1725)= -1026 Upper outer fence = (Q3+87)= (1274+1725)=2999 The outlier 2199 is a mild outlier, because it is outside the upper inner fence but within two outer fences.
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