95% confidence interval of means
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The personnel director of a large corporation wishes to study absenteeism among clerical workers at the central office during the year. A random sample of 25 clerical workers revealed the following:
_
Absenteeism: x = 9.7 days and S = 4.0 days
12 clerical workers were absent more than 10 days
What are the upper and lower limits of the 95% confidence interval estimate of the mean number of absences for clerical workers last year?
A. 8.132 and 11.268
B. 8.049 and 11.351
C. 8.052 and 11.348
D. 8.331 and 11.069.
See the attached file.
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The solution determines the upper and lower limits of 95% confidence interval of means.
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