Question: Test the claim about two population variances at the indicated level of significance. Interpret the results in the context of the claim.

Alliant Energy claims that lost time injuries of its Energy Delivery business unit is more variable than that of its Generation business unit. A random sample of 35 Energy Delivery injured employees has a standard deviation of 6 lost time injuries, and a similar sample of 25 Generation injured employees has a standard deviation of 15 lost time injuries. From past data, it is known that the company’s recordable injury results in normally distributed injury recordability. Test the company’s claim at a = 0.05.

Ho: The recordability of lost time injuries in the Energy Delivery business unit is less than or equal to the recordability of lost time injuries in the Generation business unit.

Ha: The recordability of lost time injuries in the Energy Delivery business unit is greater than the recordability of lost time injuries in the business unit Generation.

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