Statistical Quality Control-Control Charts (ISS Statistics Paper II (Old Subjective Pattern)): Questions 1 - 2 of 2

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Question number: 1

» Statistical Quality Control » Control Charts » Attributes

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Find 3-sigma control limits for a

(i) C-chart with process average equal to 4 non-conformities

(ii) U chart with process average c = 4, and n = 4.


the 3-sigma control limits is

(i) Given that c=4

Control limits for the C chart with a known non-conformities is


C.L.=c… (90 more words) …

Question number: 2

» Statistical Quality Control » Control Charts » Variable

Appeared in Year: 2015

Essay Question▾

Describe in Detail

Sample of sizes 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 25 samples have been analyzed, we have i=125xj=662.50 and i=125Rj=9.00 . Assume that the quality characteristic is normally distributed.

(i) Find the control limit for the X and R charts.

(ii) Assume that both chart exhibit control, if specifications are 26.40±0.50, estimate the fraction nonconforming. Express your answers in terms of CDF of N (0, 1) random variable.

[For n = 5, A 2 =0.577, A = 1.342, A 3 =1.427, D 1 =0, D 2 =4.918, D 3 =0, D 4 =2.115 and d 2 =2.326]


Given that X=26.5 and R=0.36

(i) For X chart, the control limits are




C.LX=X… (152 more words) …

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