(a)

Scenario: An article reported the following data on oxidation-induction time (min) for various commercial oils:

Data
86 102 130 160 180 195 133
145 214 105 145 152 154 139
87 99 92 119 129

Problem: Calculate the sample variance and standard deviation.

Process: ...

Answer: 1306.4971 and 36.1455.

(b)

Problem: 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.

Process: ...

Answer: and .