Previous studies have shown that urban bus drivers have an extremely stressful j

Question

Previous studies have shown that urban bus drivers have an extremely stressful job, and a large proportion of drivers retire prematurely with disabilities due to occupational stress. These stresses come from a combination of physical and social sources such as traffic congestion, incessant time pressure, and unruly passengers. In the paper, “Hassles on the Job: A Study of a Job Intervention with Urban Bus Drivers” (Journal of Organizational Behavior, Vol. 20, pp. 199 – 208), G. Evans et al. examined the effects of an intervention program to improve the conditions of urban bus drivers. Among other variables, the researchers monitored diastolic blood pressure of bus drivers in downtown Stockholm, Sweden. The data, in millimeters of mercury (mm Hg), are based on the blood pressures obtained prior to intervention for 30 bus drivers in the study. In adults the ideal diastolic blood pressure is less than 80 mm Hg. See data below.

            79        75        94        73        91        74        80        100      70        76       

81        81        63        90        89        95        80        95        69        85

       77        58        93        83        88        93        83        81        84

( use StatCrunch )

I.                 Exploratory Data Analysis (Chapters 1 – 3) – 18 points

A.               Describe the population of interest in a single statement.

B.               Describe the sample in a single statement.

C.               Formulate the research question.

1.               What is the purpose of this investigation?

2.               What is the parameter of interest?

D.               Summarize the data using graphical methods. (You must use statistical software to generate each of the following graphs.)

1.               Stem and leaf diagram

2.               Histogram with six classes

a)               Use class limits on the horizontal axis. Set the first lower class limit at 50 mmHg.

b)               Use a class width of 10 mm Hg

c)               Use class frequencies on the vertical axis.

d)               Show class frequency on top of bars.

3.               Box and whiskers plot

4.               Specify the shape of the distribution.

E.               Investigate the data for outliers.

1.               Calculate inner fence values.

2.               Calculate outer fence values.

3.               Do the data contain outliers? Explain.

4.               If necessary, update the data set by removing all definite outliers and redo part D. (Note that your updated data set will be used for the remainder of this investigation.)

F.               Summarize the data using numerical descriptive statistics.

1.               The table must be generated by the statistical software package and include the following statistics.

a)               The number of observations in data set

b)               Mean

c)               Median

d)               Mode

e)               Max

f)                Min

g)               Quartiles

h)               Interquartile range

i)                 Standard deviation

j)                 Variance

k)               Range

2.               Interpret the numerical value of the sample mean. Use the context of the data.

3.               Interpret the numerical value of the sample median within context.

4.               Interpret the value of the sample mode within context.

Explanation / Answer

A) Here population of interest is bus drivers in downtown, Stockholm, Sweden.

B) the sample is prior to intervention of 30 bus drivers.

c)1.effects pf intervemtion program on the stress level of bus drivers in sweden is the research question.

2.variable of interest-diastolic blood pressure

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