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Oil field pipes are internally coated in order to prevent corrosion. Researchers at a university investigated the influence that coating may have on the
surface roughness of oil field pipes. A scanning probe instrument was used to measure the surface roughness of each section in a sample of 12
sections of coated interior pipe. The data (in micrometers) are shown in the table to the right. A Minitab analysis of the data is given below. Complete
parts a and b.
2.54
1.44
2.15
1.99
1.45
1.68
2.32
1.35
2.18
One-Sample T: ROUGHD
Mean
2.33
95% CI
(1.69745, 2.20088)
SE Mean
StDev
2.15
1.81
Variable
0.11437
0.39617
12
1.94917
ROUGH
a. Locate a 95% confidence interval for the mean surface roughness of coated interior pipe on the accompanying Minitab printout
(Type integers or a decimals.)
frec
st
Enter your answer in the edit fields and then click Check Answer
Chock Answer
Clear Al
remaining
e here to search
expand button
Transcribed Image Text:Oil field pipes are internally coated in order to prevent corrosion. Researchers at a university investigated the influence that coating may have on the surface roughness of oil field pipes. A scanning probe instrument was used to measure the surface roughness of each section in a sample of 12 sections of coated interior pipe. The data (in micrometers) are shown in the table to the right. A Minitab analysis of the data is given below. Complete parts a and b. 2.54 1.44 2.15 1.99 1.45 1.68 2.32 1.35 2.18 One-Sample T: ROUGHD Mean 2.33 95% CI (1.69745, 2.20088) SE Mean StDev 2.15 1.81 Variable 0.11437 0.39617 12 1.94917 ROUGH a. Locate a 95% confidence interval for the mean surface roughness of coated interior pipe on the accompanying Minitab printout (Type integers or a decimals.) frec st Enter your answer in the edit fields and then click Check Answer Chock Answer Clear Al remaining e here to search
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