Sales $ 576,000 $ 491,500 Variable costs 189,000 260,500 Traceable fixed costs 173,500 196,400 Allocated common corporate costs 123,900 143,100 Net operating income (loss) $ 89,600 $ (108,500 ) The management of Cook is considering the elimination of the West Division. If the West Division were eliminated, its traceable fixed costs could be avoided. Total common corporate costs would be unaffected by this decision. Given these data, the elimination of the West Division would result in an overall company net operating income (loss) of

The average u. s. household has $178,600 in life insurance. the standard deviation is $25,500. a local insurance agent would like to see how households in his city compare to the national average, and selects a simple random sample of 30 households from the city. for the households in the city, the average amount of life insurance is $188,800. a. based on the sample results, construct a 95% confidence interval for the true average amount of life insurance for households in the city. b. test the h0 : $178,600 ? ? to determine if the city's sample average is significantly different from the u. s. average amount of life insurance per household. use the conventional levels of significance.