Consider the two data sets: Data Set 1: 19, 25, 35, 38, 41, 49, 50, 52, 59 Data Set 2: 19, 25, 35, 38, 41, 49, 50, 52, 99 Which of the following statements is true?

Both data sets are already in order, and their middle value is 41. The lower half is 19, 25, 35, 38 in both sets, so Q1 = (25 + 35) / 2 = 30. The upper half has middle values 50 and 52 in both sets, so Q3 = (50 + 52) / 2 = 51; therefore, both interquartile ranges are 51 − 30 = 21. The true statement is that the data sets have the same interquartile range.

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