To control the weight of jumbo ravioli packaged in a food pr

To control the weight of jumbo ravioli packaged in a food processing plant, the following data were collected on the weight of four packages of ravioli, approximately every 30 minutes. Prepare and K-control charts to monitor the weights, and comment on the results. Only 15 subgroups were available. The weights are in ounces. (Data from Schmillan and Johnson 2001.)