The article “A Thin-Film Oxygen Uptake Test forthe Evaluation of Automotive CrankcaseLubricants” (Lubric. Engr., 1984: 75–83) reportedthe following data on oxidation-induction time (min)for various commercial oils:87 103 130 160 180 195 132 145 211 105 145153 152 138 87 99 93 119 129a. Calculate the sample variance and standarddeviation.b. If the observations were reexpressed in hours, whatwould be the resulting values of the sample varianceand sample standard deviation? Answer withoutactually performing the reexpression.

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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 oxidation-induction 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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