Which of the following summary measures is affected most by outliers?
A) the first quartile
B) the second quartile
C) the third quartile
D) the fourth quartile
E) none of these

Question

Quizplus · Accepted Answer

The first, second, and third quartiles (which correspond to the 25th, 50th, and 75th percentiles, respectively) are measures of central tendency and spread that are less affected by outliers compared to means or ranges. The fourth quartile is not a standard term in statistics; typically, the term "third quartile" or "75th percentile" is used to describe the upper quartile. Therefore, none of these options are correct in the context of being "affected most by outliers."

Which of the Following Summary Measures Is Affected Most by Outliers