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The first quartile Q1 is the middle value of:
AThe lower half of the data
BThe upper half of the data
CThe whole ordered data set
DThe extreme values only
Answer & Solution
Correct answer: A. The lower half of the data
1. The quartiles are found by taking medians of halves.
2. The first quartile, Q1, is the middle value of the lower half of the data.
3. The third quartile, Q3, is the middle value, or median, of the upper half of the data.
4. The overall median is the second quartile.
_Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 2 'Descriptive Statistics', sections 2.1-2.7_
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