The following data table is taken from the study reported in Exercise 3.3.1. Here "stressed" means that the pei son reported that most days are extremely stressful or quite stressful; "not stressed" means that the person reported that most days are a bit stressful, not very stressful, or not at all stressful.

(a) What is the probability that someone in this study is stressed?
(b) Given that someone in this study is from the high income group, what is the probability that the person is stressed?
(c) Compare your answers to parts (a) and (b). Is being stressed independent of having high income? Why or why not?

Transcribed Image Text:

Income Low Medium High Total 274 216 1016 Not stressed 1,954 1,680 1,899 5,533 2.480 ,954 2,115 6,549 Stressed 526 Total