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The interquartile range measures the spread of which part of a data set?
AThe lowest 25 percent of the values
BThe highest 25 percent of the values
CThe middle 50 percent of the values
DThe whole 100 percent of the values
Answer & Solution
Correct answer: C. The middle 50 percent of the values
1. The first quartile has one quarter of the values at or below it.
2. The third quartile has three quarters of the values at or below it.
3. The gap between them therefore covers the middle half, that is the middle 50 percent, of the data.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 2 "Descriptive Statistics", section 2.2 Measures of the Location of the Data_
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