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Question - Stress by occupation. As part of a study on the impact of job stress on smoking, researchers used data from the Health and Retirement Study (HRS) to collect information on 3825 "ever-smoker" individuals who were 50 to 64 years of age.16 An ever-smoker is someone who was a smoker at some time in his or her life. The HRS survey provided the researchers with 17,043 "person-year" observations. One of the questions on the survey asked a participant how much he or she agrees or disagrees with the statement "My job involves a lot of stress." The answers were coded as a 1 if a participant "strongly agreed" and 0 otherwise. The following table summarizes these responses by occupation.
Occupation
p^
n
Professional
0.23
2447
Managerial
0.22
2552
Administrative
0.17
2309
Sales
0.15
1811
Service
0.13
2592
Mechanical
0.12
1979
Operator
2782
Farm
0.08
571
(a) For each occupation, construct a 95% confidence interval for the proportion who feel a lot of stress.
(b) Summarize the results. Do there appear to be certain groups of occupations with similar stress levels?
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