SOLUTION: The depot is using a standard of 635 hours for a particular modification effort. You are to review the standard and determine whether it should be revised. After sampling 20 of the

Algebra ->  Probability-and-statistics -> SOLUTION: The depot is using a standard of 635 hours for a particular modification effort. You are to review the standard and determine whether it should be revised. After sampling 20 of the      Log On


   

Question 835487: The depot is using a standard of 635 hours for a particular modification effort. You are to review the standard and determine whether it should be revised. After sampling 20 of these modifications you calculate a mean of 665 hours and a standard deviation of 45 hours. We are concerned that the hours might be higher or lower than the 635 hour standard. Test the standard at the .05 level of significance. Select the correct answer out of each pair of choices. (Carry intermediate calculations to three decimal places.)



The tp is 2.093

The tp is 1.729


The tc is 2.981

The tc is 13.333


We would REJECT the null hypothesis

We would FAIL TO REJECT the null hypothesis


We would recommend using the existing standard.

We would recommend revising the standard.
Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!
Population standard deviation unknown but sample standard deviation known so use t-Test.