Monitoring newspaper typesetters. Accurate typesetting is crucial to the production of high-quality newspapers and magazines. The editor of a weekly publication has instituted a process for monitoring the performance of typesetters. Each week 100 paragraphs of the publication are randomly sampled and read for accuracy. The number of paragraphs with errors is recorded in the following table for each of the last 30 weeks. Week Paragraphs with Errors Week Paragraphs with Errors 1 2 16 3 2 4 17 2 3 13 18 7 4 4 19 3 5 1 20 2 6 1 21 3 7 10 22 7 8 11 23 4 9 9 24 3 10 0 25 2 11 3 26 2 12 4 27 0 13 2 28 3 14 8 29 1 15 2 30 4

a. Construct a p-chart for the process.

b. Is the process under statistical control? Explain.

c. Should the control limits of part a be used to monitor future process output? Explain

d. Suggest two methods that could be used to facilitate the diagnosis of causes of process variation.