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kurio (1) [Avatar] Offline
#1
The explanation of quartiles on p. 190 (points 4 & 5) is not very clear. The example in the paragraph following (Consider the sorted list...) is completely wrong regarding Q1 and Q3. Solving the problem using the TI 84 plus, Q1 = 1.5, and Q3 = 15.
christopher.mitchell (11) [Avatar] Offline
#2
Thank you very much for catching this error! The errata now reflect that the median is omitted from the calculation of the "middle" value for Q1 and Q3, and that the two middle values are averaged if there are an even number of values. In addition, the incorrect Q1 and Q3 values in the following paragraph have been corrected.