Ill. (q6-q10) For a process in control, 10 samples of 200 packages each of tenni

Question

Ill. (q6-q10) For a process in control, 10 samples of 200 packages each of tennis strings were tested for breaking strength. A total of 160 packages of the 2000 tested failed to conform to the manufacturer's specifications. 6. The process proportion defective when the process is in control is: B) 10 D) 0.02 A) 16 C) 0.08 7. The upper and lower control limits for the p chart are: D) 0.16 1.64 B) 0-2 C) 2.4-4.8 A) 0.02 0.14 8. What conclusion should be made about the process if a new sample of 200 packages is taken and 30 are defective? B) The process is out of control A) The process is in control 9. Compute the upper and the lower limits of the np chart. A) 0 10.86 B) 2.04 4.86 C) 0 22.34 D) 4.5 -27.5 10. For what number of defective items the process is in control: D) 45 C) 10 B) 1 A) 2

Explanation / Answer

6)=160/2000=0.08 option C

7)here std error =(p(1-p)/n)1/2 where n=200

=0.02

hence control limit =p -/+ 3*std error =0.02 ; 0.14

option A

8)the process is out of control as proportion defective=30/200=0.15 is out of control limit

9)upper and lower limt =np =4.5 ; 27.5 option D

10) option C

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