Question 6 A study on a range of automotive lubricants reported the following data on oxidation-induction time (min) for various commercial oils: Oxidation-Induction Time: 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 for the oxidation-induction time. b. If the observations were converted and displayed in hours, what would be the resulting values of the sample variance and sample standard deviation? Answer without actually performing the conversion.

Q: ecimal:

A: From triangle BDC , BD=18mm,∠DAB=45°,∠DCB=αBA=dAC=b

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