Find observed significance level for test and interpret

Reference no: EM131028726

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.

CPU Time	Job Number
CPU Time
(minutes)	I	2	3	4	5	6	7	8	9	10	11
Estimated	.50	1.40	.95	.45	.75	1.20	1.60	2.6	1.30	.85	.60
Actual	.46	132	.99	.53	.71	1.31	149	2.9	1.41	.83	.74

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 α=.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.

Reference no: EM131028726

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