Question

Samples of 5 items each were taken from a manufacturing process at regular intervals. A quality characteristic is measured and (ar{x}) and R values are calculated for each sample. After 25 samples, we have: (sum_{i=1}^{25} ar{x}_i = 2.250.) (sum_{i=1}^{25} R_i = 100) Assuming that the quality characteristic is normally distributed. 6. What is the estimated process standard deviation? (a) 0.9 (b) 1.1 (c) 1.3 (d) 1.5 (e) 1.7 7. What is the lower control limit of the (ar{x})-chart? (a) 85 (b) 88 (c) 91 (d) 94 (e) 97 8. What is the upper control limit of the R-chart? (a) 6.1 (b) 6.7 (c) 7.3 (d) 7.9 (e) 8.5

          Samples of 5 items each were taken from a manufacturing process at
regular intervals. A quality characteristic is measured and (ar{x}) and R
values are calculated for each sample. After 25 samples, we have:
(sum_{i=1}^{25} ar{x}_i = 2.250.) (sum_{i=1}^{25} R_i = 100)
Assuming that the quality characteristic is normally distributed.
6. What is the estimated process standard deviation?
(a) 0.9	(b) 1.1	(c) 1.3	(d) 1.5	(e) 1.7
7. What is the lower control limit of the (ar{x})-chart?
(a) 85	(b) 88	(c) 91	(d) 94	(e) 97
8. What is the upper control limit of the R-chart?
(a) 6.1	(b) 6.7	(c) 7.3	(d) 7.9	(e) 8.5

Samples of 5 items each were taken from a manufacturing process at
regular intervals. A quality characteristic is measured and (arx) and R
values are calculated for each sample. After 25 samples, we have:
(sumi=1^25 arxi = 2.250.) (sumi=1^25 Ri = 100)
Assuming that the quality characteristic is normally distributed.
6. What is the estimated process standard deviation?
(a) 0.9 (b) 1.1 (c) 1.3 (d) 1.5 (e) 1.7
7. What is the lower control limit of the (arx)-chart?
(a) 85 (b) 88 (c) 91 (d) 94 (e) 97
8. What is the upper control limit of the R-chart?
(a) 6.1 (b) 6.7 (c) 7.3 (d) 7.9 (e) 8.5

Added by Phillip M.

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