What is useful in identifying extreme values or outliers?
A) The coefficient of variation
B) Z scores
C) The standard deviation
D) The sample variance

Question

Quizplus · Accepted Answer

Z scores are the best choice for identifying extreme values or outliers as they measure the distance of a data point from the mean in terms of standard deviation units. A Z score greater than 3 or less than -3 is considered an outlier. The coefficient of variation (A) is a measure of relative variability, while the standard deviation (C) and sample variance (D) are measures of dispersion and variability, respectively, but do not directly identify outliers.

What Is Useful in Identifying Extreme Values or Outliers