- Does the OTR time appear to be stable? Why or why not?
Create a Moving Range Control Chart for each country code to answer the question. Copy and paste the
graphs only for the country codes that are not stable. - If you were to use a control chart to evaluate stability, which chart would you use? Why?
- What can you learn about the distribution of the installation process?
- Does it appear that the country has an impact on installation time? Why or why not?
Sample Solution