If the Upper and Lower Control Limits Are Set at ±3

question 78

Multiple Choice

If the upper and lower control limits are set at ±3 standard deviations from the mean,we would expect that ________.

• A)99.7% of the sample means are within the control limits
• B)95% of the sample means are within the control limits
• C)about 68% of the sample means are within the control limits
• D)about 5% of the sample means are outside the control limits

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Definitions:

Exponential Smoothing Forecast

A time series forecasting method that applies decreasing weights to older data.

Previous Forecast Value

The forecast figure from the immediately preceding time period, used as a point of reference or comparison for current forecasting activities.

Operational Variations

Fluctuations in operational performance that can result from a variety of factors, including changes in demand, supply chain issues, or equipment failures.

Time Series

A sequence of data points, typically consisting of successive measurements made over a time interval.