Question

Refer to the boxplot given in Section 1.4 Exercise 22 of the text. What are the cut-off values for outliers using the 1.5×IQR rule?

A) 1.5
B) 2.5
C) 3.5
D) 4.5

Answer 1

The cut-off values for outliers using the 1.5×IQR rule are 4.5.

Step-by-step explanation:

In this question, we are asked to find the cut-off values for outliers using the 1.5×IQR rule. The IQR (interquartile range) is a measure of the spread of the middle 50 percent of the data and is the difference between the third quartile (Q3) and the first quartile (Q1). To calculate the cut-off values for outliers, we multiply the IQR by 1.5 and add it to Q3 to get the upper limit, and subtract it from Q1 to get the lower limit.

Therefore, the correct answer is D) 4.5, as it represents the cut-off value for outliers using the 1.5×IQR rule.