QUESTION 24 A collection of 40 samples (n= 4) yields sum R\'s = 12.15. lf 2 samp

Question

QUESTION 24 A collection of 40 samples (n= 4) yields sum R's = 12.15. lf 2 samples with range values of .55 and .53 plot outside the control limits, the control limits after removing the bad samples would be: Hint: since we are throwing out the bad samples we're now dealing with 38 remaining samples, and the new sum of R's = 12.15-.55-53, now use these two pieces of information to calculate the new control limits for the R chart with the bad samples removed.) .6341.0 0.6647,.1o 0,6647, 0 .7103.0

Explanation / Answer

after throwing those ; sum of R's =12.15-0.55-0.53=11.07

from above estimation of mean Range Rbar =11.07/38 =0.2913

for n=4 ; standard coefficients D3 =0 and D4 =2.282

hence Upper control limit =D4*Rbar =2.282*0.2913=0.6647

and lower control limit =D3*R =0*0.2913 =0

threfore correct option is 0.6647 ,0

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