Absentees in the Workplace
Essay by review • November 11, 2010 • Study Guide • 855 Words (4 Pages) • 1,509 Views
UNIT OFDATA OBSERVATIONSUMMARY
The unit of observations were random samples of twenty-five various employees divided into two distinct, independent populations, smokers and non-smokers. Then data on their absences from work for the previous year were obtained and used in this statistical inference. Because of a strong association between smoking and ill-health, it is generally accepted that smokers miss more work than their non-smoking counterparts. Does the smoker miss more work than the non-smoker? Data from these random samples were used to draw a conclusionÐ'....
SMOKERSDATA **VERSUS**DEFINITION NON-SMOKERSTABLE
Unit of Observation: Smoking and Non-Smoking Employees
Variable Name: Definition: Unit of Measurement: Data Source:
Smoker Employee Days Absent in Past Year http://lad.org/issues/4/horizon.html;
Smokes July 11, 2000
Non-Smoker Employee Does Days Absent in Past Year http://lad.org/issues/4/horizon.html;
NOT Smoke July 11, 2000
RANDOMDATA SAMPLESLISTING
Smokers: Absentees: Non-Smokers: Absentees:
Employee 1 10 Employee 1 5
Employee 2 8 Employee 2 9
Employee 3 18 Employee 3 2
Employee 4 8 Employee 4 10
Employee 5 11 Employee 5 12
Employee 6 17 Employee 6 11
Employee 7 19 Employee 7 6
Employee 8 21 Employee 8 9
Employee 9 16 Employee 9 12
Employee 10 2 Employee 10 8
Employee 11 4 Employee 11 4
Employee 12 12 Employee 12 7
Employee 13 11 Employee 13 13
Employee 14 6 Employee 14 6
Employee 15 9 Employee 15 7
Employee 16 13 Employee 16 11
Employee 17 24 Employee 17 10
Employee 18 15 Employee 18 18
Employee 19 14 Employee 19 20
Employee 20 3 Employee 20 4
Employee 21 0 Employee 21 10
Employee 22 9 Employee 22 2
Employee 23 11 Employee 23 8
Employee 24 19 Employee 24 5
Employee 25 10 Employee 25 10
Mean: 11.6 Mean: 8.76
Standard Deviation: 6.110100927 Standard Deviation: 4.352011029
Variances: 37.33333333 Variances: 18.94
SOURCE: http://lad.org/issues/News/4/horizon.html; July 11, 2000
STATISTICAL ANALYSISOUTPUT
F-Test Two-Sample for Variances
Smokers Non-Smokers
Mean 11.6 8.76
Standard Deviation 6.110100927 4.352011029
Variance 37.33333333 18.94
Observations 25 25
df 24 24
F 1.971136924
P(F<=f) one-tail 0.051571253
F Critical one-tail 1.983757159
t-Test: Two-Sample Assuming Equal Variances
Smokers Non-Smokers
Mean 11.6 8.76
Variance 37.33333333 18.94
Observations 25 25
Pooled Variance 28.13666667
Hypothesized Mean Difference 0
df 48
t Stat 1.892940764
P(T<=t) one-tail 0.032201762
t Critical one-tail 1.677224191
P(T<=t) two-tail 0.064403523
t Critical two-tail 2.01063358
CAN
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