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Samples of size n=5 are taken from a manufacturing process every hour. A particular quality
characteristic, which is normally distributed, is measured, and X-bar and R are calculated for
each sample. After 25 samples, we have the following sums E of X-bar values = 662.5 E of R
values = 9.00 a) Find the Control Limits of the X-bar and R charts b) Assume both charts exhibit
"in contro behavior. If the process specifications are 26.40 plus or minus 0.30, estimate the
fraction non-conforming c) If the mean of the process were adjusted to exactly 26.40, what
would be the new fraction non-conforming?

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Samples of size n=5 are taken from a manufacturing process every hou.pdf

  • 1. Samples of size n=5 are taken from a manufacturing process every hour. A particular quality characteristic, which is normally distributed, is measured, and X-bar and R are calculated for each sample. After 25 samples, we have the following sums E of X-bar values = 662.5 E of R values = 9.00 a) Find the Control Limits of the X-bar and R charts b) Assume both charts exhibit "in contro behavior. If the process specifications are 26.40 plus or minus 0.30, estimate the fraction non-conforming c) If the mean of the process were adjusted to exactly 26.40, what would be the new fraction non-conforming?