Part 1
Hop Scotch Drive-In Restaurant is considering a new marketing idea. At Hop Scotch, diners have the choice of dining inside or staying in their cars to eat. To serve those dining in their cars, carhops take the orders at the car and bring the food to the car when it’s ready. Many people want fast service when they pull into the drive-in restaurant, but they also want more than a drive-through restaurant can offer. To try to meet their customers’ expectations, Hop Scotch Drive-In is proposing to promise to have a server at your car in two minutes or less after your arrival at their drive-in. Before making this promise, the owners of Hop Scotch want to see how long it takes their serves to reach the cars now. They have gathered the information in Table C7.1.1.
Assignment
Calculate the range for each of the subgroups containing five server times. Since the owners of Hop Scotch Drive-In are interested in the combined performance of their servers and not the performance of any particular server, the subgroups contain times from each server. Use these calculated values to determine the process capability and the Cp and Cpk values. How well is the process performing when compared with the specifications of 2.0 min +0.0/-1.0?
