51. The article A Thin-Film Oxygen Uptake Test for the Evaluation of Automotive Crankcase Lubricants (Lubric. Engr.,

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51. The article “A Thin-Film Oxygen Uptake Test for the Evaluation of Automotive Crankcase Lubricants” (Lubric.

Engr., 1984: 75–83) reported the following data on oxidationinduction time (min) for various commercial oils:

87 103 130 160 180 195 132 145 211 105 145 153 152 138 87 99 93 119 129

a. Calculate the sample variance and standard deviation.

b. If the observations were reexpressed in hours, what would be the resulting values of the sample variance and sample standard deviation? Answer without actually performing the reexpression.

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Probability And Statistics For Engineering And The Sciences

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Authors: Dave Ellis, Jay L Devore

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51. The article A Thin-Film Oxygen Uptake Test for the Evaluation of Automotive Crankcase Lubricants (Lubric. Engr.,

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