Samples of size n = 5 are taken from a manufacturing process every hour. A quality characteristic is measured, and x and R are computed for each sample. After 2 samples have been analyzed, we have

The quality characteristic is normally distributed.
(a) Find the control limits for the x and R charts.
(b) ssume that both charts exhibit control. If the specifications are 26.40  0.50, estimate the fraction nonconforming.
(c) If the mean of the process were 26.40, what fraction nonconforming would result?

Transcribed Image Text:

25 yx -1 25 662.50 and Σ R 9.00 -1