Persons submitting computing jobs to a computer center

Chapter 12, Problem 34SE

(choose chapter or problem)

Persons submitting computing jobs to a computer center usually are required to estimate the amount of computer time required to complete the job. This time is measured in CPUs, the amount of time that a job will occupy a portion of the computer's central processing unit's memory. A computer center decided to perform a comparison of the estimated versus actual CPU times for a particular customer. The corresponding times were available for 11 jobs. The sample data are given in the accompanying table.

a Why would you expect that the observations within each of these pairs of data to be correlated?                                                                                                b Do the data provide sufficient evidence to indicate that, on the average, the customer tends to underestimate the CPU time required for computing jobs? Test using \(\alpha=.10\).                        c Find the observed significance level for the test and interpret its value.                                d Find a 90% confidence interval for the difference in mean estimated CPU time versus mean actual CPU time.

Equation transcription:

Text transcription:

alpha=.10