Obtain approximately 10 small bags of M&M candies (multicoloured), or similar candies. Arrange the unopened bags in a single row, and treat each bag as a sample from an ongoing process, in the order you have placed them. Treat the yellow candies (or another colour that is the fewest in number in each bag) as defects.
a. List the four or five steps needed to obtain sample information for each bag, beginning with opening the bag.
b. Determine the upper and lower control limits for the sample proportion of defectives using Three Sigma control limits. Note: the number of candies in each bag may not be exactly the same. You can ignore that.
c. Is the process variation random? Explain how you reached your conclusion.