1. Which nominal or ordinal variable (day, shift, model, or foaming machine) seems to have a significant impact on the number of defects in the foaming process? Based on the results of the first method, where would you suggest further investigation should occur?

2. Construct and analyze the appropriate quality control charts for each day, first with specified mean and control limits, and then with the calculated mean and control limits. What conclusions can you draw from this analysis?

3. From your analysis of the foam weight, is the process in control?

4. What is the Cp and Cpk for the process? What does this tell you?

5. Using additional statistical techniques, what other insights can you determine about potential root causes for the defects?

6. What recommendations would you make to the quality control team for the next steps to address issues in the foaming process?