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4.2 Ratings (845 Votes)

UCL=P bar+ Factor

LCL=Pbar-Factor

UCL =1.050

and LCL=0.589

P bar=total defective answers/total sum of n or 25

1	B	C	D
2	Sample	defective answers	P or Proportion of correct answers
3	25	21.25	15%
4	25	21	16%
5	25	20.25	19%
6	25	21	16%
7	25	21.25	15%
8	25	21.5	14%
9	25	19.75	21%
10	25	19.75	21%
11	25	20.75	17%
12	25	19.75	21%
13	25	19.25	23%
14	25	21	16%
15	25	19.5	22%
16	25	21.25	15%
17	25	21.25	15%
18	25	20	20%
19	25	19.25	23%
20	25	21	16%
21	25	19.75	21%
22	25	21.25	15%
23	P bar	0.8195
24	Factor calculation	0.231
25	UCL	1.050
26	LCL	0.589

Formula:

1	B	C	D
2	Sample	defective answers	P or Proportion of correct answers
3	25	=(25*(1-D3))	0.15
4	25	=(25*(1-D4))	0.16
5	25	=(25*(1-D5))	0.19
6	25	=(25*(1-D6))	0.16
7	25	=(25*(1-D7))	0.15
8	25	=(25*(1-D8))	0.14
9	25	=(25*(1-D9))	0.21
10	25	=(25*(1-D10))	0.21
11	25	=(25*(1-D11))	0.17
12	25	=(25*(1-D12))	0.21
13	25	=(25*(1-D13))	0.23
14	25	=(25*(1-D14))	0.16
15	25	=(25*(1-D15))	0.22
16	25	=(25*(1-D16))	0.15
17	25	=(25*(1-D17))	0.15
18	25	=(25*(1-D18))	0.2
19	25	=(25*(1-D19))	0.23
20	25	=(25*(1-D20))	0.16
21	25	=(25*(1-D21))	0.21
22	25	=(25*(1-D22))	0.15
23	P bar	=SUM(C3:C22)/SUM(B3:B22)
24	Factor calculation	*=3(SQRT(((1-C23)C23)/25))*
25	UCL	=C23+C24
26	LCL	=C23-C24

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