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# COMMON DATA ANALYSIS ASSIGNMENT FOR MTH 241 – STATISTICS I MTH 241 COMMON DATA ANALYSIS ASSIGNMENT (Spring 2018) Note: The due date of this data analysis is to be announced. Previous studies have...

COMMON DATA ANALYSIS ASSIGNMENT FOR MTH 241 – STATISTICS I MTH 241 COMMON DATA ANALYSIS ASSIGNMENT (Spring 2018) Note: The due date of this data analysis is to be announced. 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. See data below. 89 88 91 95 90 99 90 83 74 85 80 73 70 94 66 76 77 90 77 69 79 93 84 93 81 81 70 95 100 81 A. Exploratory Data Analysis a. Summarize the data using a… 1. stem and leaf diagram. 2. histogram. 1. Use a class width of 10 mm Hg. 2. Start with a class limit of 60 mm HG. 3. Use frequencies on the vertical axis. 4. Show class frequency on top of bars. b. Investigate the data for definite outliers. Drop all definite outliers from the set and redo part a. c. Summarize the data set using a table of descriptive statistics. The table must be generated by a statistical software and include the following statistics: 1. The number of observations in data set 2. Mean 3. Median 4. Mode 5. Max 6. Min 7. Standard deviation 8. Variance 9. Range B. Inferential Statistics a. Use a STATISTICAL SOFTWARE to construct a 95% confidence interval for µ, the population mean diastolic blood pressure of all urban bus drivers in Stockholm. b. In adults the ideal diastolic blood pressure is less than 80 mm Hg. At the 5% significance level, do the data provide sufficient evidence to conclude that the mean diastolic blood pressure of bus drivers in Stockholm exceeds the normal diastolic blood pressure of 79 mm Hg? Have Software conduct the appropriate test. Using the software output, perform the full hypothesis test. c. Are the results of the confidence interval and hypothesis test the same? Explain why or why not. C. Project Summary & Findings a. Write a brief introductory paragraph regarding the background of data. b. Write paragraph (or two) that specifies the shape of the distribution of the data and reference your graph(s) used to make your decision. c. Discuss the presence or absence of outliers. d. Interpret the following values within context for the sample mean, median, and mode. e. State the range of the data and the standard deviation. f. State the practical interpretation for the 95% confidence interval. g. State the null hypothesis, the test-statistic, and the p-value for the hypothesis test in B). h. Clearly state your conclusions of the hypothesis test within context and include the significance level in your statement. D. Format for submitting Statistics Project a. First – page: Title page with appropriate project title, name, course number and section number. (The title page must be typed.) b. Part C) c. Part A) – include all software Output. d. Part B) – include all software Output. e. How has this project helped you understand the purpose and value of the study of statistics? Your response must be in complete sentences.
Answered Same Day May 01, 2020

## Solution

Pooja answered on May 01 2020
Diastolic blood pressure of bus drivers
Name:
Course number:
Section number:
Part A)
a)
Stem and leaf diagram:
Stem-and-Leaf Display: BLD_PR
Stem-and-leaf of BLD_PR N = 30
Leaf Unit = 1.0
2 6 69
6 7 0034
10 7 6779
(6) 8 011134
14 8 589
11 9 0001334
4 9 559
1 10 0
Histogram:
)
Boxplot:
There are no significant outliers in the data.
c)
Descriptive statistics:
Descriptive Statistics: BLD_PR
Variable N Mean SE Mean StDev Variance Minimum Median Q3 Maximum Range Mode
BLD_PR 30 83.77 1.72 9.42 88.81 66.00 83.50 91.50 100.00 34.00 81, 90
N fo
Variable Mode
BLD_PR 3
Part B)
a)
H0: the mean diastolic blood pressure of bus drivers in Stockholm is equal to the the normal diastolic blood pressure. u = 79
H1: the mean diastolic blood pressure of bus drivers in Stockholm exceeds the normal diastolic blood pressure. u > 79
One-Sample T: BLD_PR
Test of μ = 79 vs ≠ 79
Variable N Mean StDev SE Mean 95% CI T P
BLD_PR 30 83.77 9.42 1.72 (80.25, 87.29) 2.77 0.010
Since confidence interval doesn’t contain zero, I reject Ho and conclude that the mean diastolic blood pressure of bus drivers in Stockholm exceeds the normal diastolic blood pressure. u > 79
)
H0: the mean diastolic blood pressure of bus drivers in...
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