The interquartile range is IQR = Q3 - Q1. Thus, it can be thought of as
A) the 75% interquartile range.
B) the quartile or 25% of the variable.
C) the middle 50% of the variable.
D) the incorporation of all observations.

Question

Quizplus · Accepted Answer

The interquartile range (IQR) is the difference between the third quartile (Q3) and the first quartile (Q1), representing the range of the middle 50% of the data. This excludes the lowest 25% and the highest 25% of the data, focusing on the central portion.

The Interquartile Range Is IQR = Q3 - Q1