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After returning from a two-week vacation, you are reviewing the X-bar and R charts which have been maintained during your absence. One of the X-bar charts shows the last 50 points to be very near the centre line. In fact, they all seem to be within about one sigma of the centre line. What is the best explanation for this occurrence?

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After returning from a two-week vacation, you are reviewing the X-bar and R charts which have been maintained during your absence. One of the X-bar charts shows the last 50 points to be very near the centre line. In fact, they all seem to be within about one sigma of the centre line. What is the best explanation for this occurrence?





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