Refer to Problem 1 concerning a filling machine for a tea bag manufacturer (data stored in Tea3). In that problem, you should have concluded that the process is in control. The label weight for this product is 5.5 grams, the LSL is 5.2 grams, and the USL is 5.8 grams. Company policy states that at least 99% of the tea bags produced must be inside the specifications in order for the process to be considered capable.
a. Estimate the percentage of the tea bags that are inside the specification limits. Is the process capable of meeting the company policy?
b. If management implemented a new policy stating that 99.7% of all tea bags are required to be within the specifications, is this process capable of reaching that goal? Explain.
Problem 1: A filling machine for a tea bag manufacturer produces approximately 170 tea bags per minute. The process manager monitors the weight of the tea placed in individual bags. A subgroup of n = 4 tea bags is taken every 15 minutes for 25 consecutive time periods. The results are stored in Tea3.
a. What are some of the sources of common cause variation that might be present in this process?
b. What problems might occur that would result in special causes of variation?
c. Construct control charts for the range and the mean.
d. Is the process in control?
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