Attributes:

1. Pareto analysis of an extrusion process has identified that surface cracking is the #1 defect resulting in non-conforming product. The quality improvement team would like to study the proportion of non-conforming to assist in monitoring the process improvement efforts. Samples have been collected from the process of n=100 and the results have been recorded in the accompanying Excel file. Use the data in the Excel file "Q1" and identify the appropriate chart to be used for monitoring this process and answer the following questions:

(a) (1pt) What is the appropriate chart?

(b) (1pt) Using the data set for Part (b) Calculate the centerline and control limits

(c) (1pt) Construct the control chart and interpret this results

(d) (2pts) Using the data set for Part (d) plot the newly collected data on the chart constructed in Part (c), what can be said regarding the state of the process?

2. Scratches in painted panels has been identified as the primary defect leading to non-conforming product from a manufacturing process. Count information for samples of size n=100 has been collected for all scratches observed in output from the process for the last 60-shifts. Using the data in the Excel file Q2, identify the appropriate chart to monitor the process for the number of scratches observed and answer the following questions:

(a) (1pt) What is the appropriate chart?

(b) (2pts) Using the data in the Excel file, calculate the centerline and control limits for the chart.

(c) (2 pts) Construct the chart and comment on what may be occurring in this process.