Question

A study of unexcused absenteeism among factory workers looked at a year's records for 150 workers in a factory LA County. The mean number of days absent for the sample was 9.5 and the population standard deviation was 2.2 days. Regard these workers in this year as a random sample of all workers in all years as long as this factory does not change work conditions or worker benefits. The study claimed that the average number of days employees were absent was less than 10 days, is there evidence that this number has decreased? Use LaTeX: \alpha =0.01.

State the claim: LaTeX: H_0\:\:\:\muH 0 μ =10

LaTeX: H_1\:\muH 1 μ < 10 claim

Determine the direction of the tails: Left, Right, or Two: left

Find the critical value:

Compute Test Point (round to 2 place values) :

Do we Reject or Not reject?

Summarize: There is enough evidence _________________ to the claim.

Answer #1

The R-code is for critical value

round(qnorm(0.01),2)

[1] -2.33

a study of unexcused absenteeism among factory workers looked at
a years reocords for 65 workers in an english factory and found the
mean number of days absent was 10.34. Regard these workers in this
year as a random sample of all workers in all the years as long as
this factory does not change work conditions or benefits. Assume
the population standard deviation of number of unexcused absences
for all workers is known to be 18.867 days.
1- construc...

1. The English Labor Minister thinks the average factory worker
misses more than 7 days of work each year. He hires a research firm
to conduct a study of unexcused absenteeism among factory workers.
Their sample of 115 workers in English factories had a mean number
of days absent of 9.88 and the standard deviation was 17.75
days.
a) Is there sufficient evidence at alpha=.05 to support the
Minister’s hypothesis? (10 points)
b) Is there sufficient evidence at alpha=.01 to...

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