Consider the grinding force data in Exercise 10-40. Is there any indication that the variances of grinding force are different at the two different levels of temperature?

Exercise 10-40

An article in Quality Engineering [2012, Vol. 24(1)] described an experiment on a grinding wheel. The following are some of the grinding force data (in N) from this experiment at two different vibration levels.

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242, 249, 235, 250, 254, 244, 258, 311, 237, 261, 314, 252 High 302, 421, 419, 399, 317, 311, 350, 363, 392, 367, 301, 302 Low