Oil field pipes are internally coated in order to prevent corrosion. Researchers at a university investigated the influe

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Oil Field Pipes Are Internally Coated In Order To Prevent Corrosion Researchers At A University Investigated The Influe 1 (75.68 KiB) Viewed 40 times

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 8 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. One-Sample T: ROUGH Variable N Mean StDev SE Mean 95% CI ROUGH 8 1.94125 0.46178 0.16326 (1.55519, 2.32731) -C 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.) 1.77 2.54 2.39 1.29 1.31 2.11 1.95 2.17 b. Would you expect the average surface roughness to be as high as 2.5 micrometers? Explain. O A. Yes, because we can be 95% confident that the mean surface roughness lies between the lower and upper bounds of the interval, and 2.5 lies within the interval. OB. Yes, because we can be 95% confident that the mean surface roughness lies outside the lower and upper bounds of the interval, and 2.5 lies within the interval. O C. Yes, because we can be 95% confident that the mean surface roughness lies outside the lower and upper bounds of the interval, and 2.5 lies outside the interval. O D. No, because we can be 95% confident that the mean surface roughness lies between the lower and upper bounds of the interval, and 2.5 lies outside the interval.