Question: 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.