An engineer is studying the slight differences in the length of roofing shingles that is being produced at his roofing company. These differences fall within the specification of the product. This is an example of common-cause variation.

25. kerry company plans to sell 200,000 units of finished product in july and anticipates a growth rate in sales of 5% per month. the desired monthly ending inventory in units of finished product is 80% of the next month's estimated sales. there are 150,000 finished units in inventory on june 30. kerry company's production requirement in units of finished product for the three-month period ending september 30 is: a. 712,025 units b. 630,500 units c. 664,000 units d. 665,720 units

When used-car dealers signal the quality of a used car with a warranty, a. buyers believe the signal because the cost of a false signal is high b. it is not rational to believe the signal because some used-car dealers are crooked c. the demand for lemons is eliminated d. the price of a lemon rises above the price of a good used car because warranty costs on lemons are greater than warranty costs on good used cars

Which is cheaper: eating out or dining in? the mean cost of a flank steak, broccoli, and rice bought at the grocery store is $13.04 (money.msn website, november 7, 2012). a sample of 100 neighborhood restaurants showed a mean price of $12.75 and a standard deviation of $2 for a comparable restaurant meal. a. develop appropriate hypotheses for a test to determine whether the sample data support the conclusion that the mean cost of a restaurant meal is less than fixing a comparable meal at home. b. using the sample from the 100 restaurants, what is the p-value? c. at a = .05, what is your conclusion? d. repeat the preceding hypothesis test using the critical value approach