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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Matrices

‘Matrices’ is the plural form of the word matrix, and it is basically a spreadsheet in the form of a box. In mathematics, various functions can be carried out with matrices. Generally, a matrix comes in the shape of a square or rectangle. The elements are distributed horizontally in the form of rows, and vertically in the form of columns.