A filling machine for a tea bag manufacturer produces approximately 170
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A filling machine for a tea bag manufacturer produces approximately 170

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?

Hint
StatisticsThe range of any data is the variation from the smallest to the largest value in the distribution. It is a widely used indicator of variation. The discrepancy between the maximum and minimum values in a collection of data is defined as its range. To determine the range, sort the data from least to largest. Then, in the range, remove the smallest value from the largest value. The range is...

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