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