Question: (10 pts) You have just been hired by Big Bertha’s House of Snowglobes to redesign the control scheme for the concentration of snow in each globe. Snowglobes that come off the production line are randomly put in open containers and wait to be packed for shipping. The containers are not stored in any particular order and containers may sit there for minutes, hours, or days before being packed for shipping. Currently the inspector goes out to the production area to take a sample of product exactly every 2 hours. He grabs four snowglobes from any container for his sample.

a. With respect to rational subgrouping, what problem(s) do you think Big Bertha’s is having and what impact could it be having on the control charts?

b. Can you fix it? Briefly explain what you would recommend.