# 4.3 Diagnostics on the Least-Squares Regression Line

The accompanying data represent the monthly rate of return of a certain company’s common stock for the past few years. Complete parts (a) and (b) below.

0.26 0.26 0.04 0.06 0.06 − 0.04 − 0.04 0.22

0.46 0.06 − 0.15 0.19 0.05 0.18 0.09 0.02

− 0.05 − 0.02 0.08 0.02 − 0.02 0.13 − 0.08 − 0.02

0.06 − 0.01 0.07 − 0.05 0.01 − 0.10 0.02 0.03

0.01 0.11 − 0.11 0.09 0.10 0.25 − 0.02 0.03

0.46 0.06 − 0.15 0.19 0.05 0.18 0.09 0.02

− 0.05 − 0.02 0.08 0.02 − 0.02 0.13 − 0.08 − 0.02

0.06 − 0.01 0.07 − 0.05 0.01 − 0.10 0.02 0.03

0.01 0.11 − 0.11 0.09 0.10 0.25 − 0.02 0.03

(a) Determine and interpret the quartiles.

The first quartile is

negative 0.02

(Round to four decimal places as needed.)

The second quartile is

0.035.

(Round to four decimal places as needed.)

The third quartile is

0.0925.

(Round to four decimal places as needed.)

Interpret the quartiles. Choose the correct answer below.

**Your answer is correct.**

(b) Check the data set for outliers. Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

Your answer is correct.