Question: On an X-bar chart, many plot points are noted in zone B, some in zone C, and a few in zone A. What could be

On an X-bar chart, many plot points are noted in zone B, some in zone C, and a few in zone A. What could be occurring in the process?

Select one:

a. Stratification

b. Trends or overcorrections

c. Mixtures or systemic variation

d. Improper calculation of the control limits

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