Your co-worker is not happy about your control chart, which shows production over the past 25 days.
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Question:
Your co-worker is not happy about your control chart, which shows production over the past 25 days. In particular, the centerline is 1,000, and the control limits are 300 and 1700. She thinks the control limits are way too wide. She says, "Let\'s take some more data. This only shows 25 days\' worth of data points. I bet if we take 100 days\' worth of data points, the control limits will narrow down to something like 900 - 1100, because we will have a more statistically valid sample."
Is she correct? In particular, will taking more days\' worth of data help narrow the control limits?
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