
Concept explainers
(a)
To find: The
(a)

Answer to Problem 124E
Solution: The
Explanation of Solution
Given: The summary table is provided.
Calculation: The standard deviation of a sample proportion with estimated mean
The
The value of
For the professional,
Thus, the
Hence, the interval is
Thus, the
Hence, the interval is
Thus, the
Hence, the interval is
For the sales,
Thus, the
Hence, the interval is
For the mechanical,
Thus, the
Hence, the interval is
Thus, the
Hence, the interval is
For the operator,
Thus, the
Hence, the interval is
For the farm,
Thus, the
Hence, the interval is
Interpretation: From the above results, it is observed that the
(b)
Whether there are any groups of occupations with similar stress levels in the result of part (a).
(b)

Answer to Problem 124E
Solution: Yes, the stress level of the occupations professional and managerial are same.
Explanation of Solution
From part (a), the
Occupations | |
professional | |
managerial | |
administrative | |
sales | |
mechanical | |
service | |
operator | |
farm |
From the above results, it is observed that the stress level for the occupations professional and managerial are same and for mechanical and operator the stress level is comparable and also the stress level of stress and administrative are almost comparable.
(c)
The reason for the concern about the standard deviation formula in part (a).
(c)

Answer to Problem 124E
Solution: The reason for the concern is that the result may not that accurate due to the consideration of less stressed people among the major stressed people.
Explanation of Solution
In the part (a), the result is not that accurate because there is no consideration for people with stress but not a lot of stress. People with a little stress is also counted among the people with major stress. Therefore, the use of binomial distribution in this problem is not so adequate.
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Chapter 6 Solutions
Introduction to the Practice of Statistics: w/CrunchIt/EESEE Access Card
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