Session 5 Grp 8 Ab1, Msa Attribute Worksheet

7/27/2019 Session 5 Grp 8 Ab1, Msa Attribute Worksheet

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Grp 8

MSA Attribute

Three receptionists receive the order from customer namely Juli, Mona, Rajesh. In order to

check the receptionist efficiency the study was carried out. It was decided, if the order is

recorded correctly alongwith other details of customer then categorize as conformity (C) orotherwise non conformity (N). The following table gives the data of three receptionists-

Sr

.N

o

C/

N

Juli Mona Rajesh

T1 T2 T3 T1 T2 T3 T1 T2 T3

1 C c c c c c c c c C

2 N n c n n n n n n C

3 C C C C N N C C C N

4 N N N N N N N C N N

5 C C N C C C C C C C

6 C C C C N C C C C N

7 N N N N N N N C N C

8 N N N N C C N N N N

9 C C C N C C C C C C

10 N N N N N N N N N N

11 N N N N N C N N N N

12 C C C C C C C C C C

13 C C N N C C C C N C

14 N N C N N C N N N N


16 C C C C N C C C C N


18 N N N C N C N N N N


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20 N N N N N N N C N N

Method

n Select the n samples, 3 operators & 1 team member (Expert)n Arrange the gaugen Give the numbering to n samplesn These samples are analyzed by the expert & information is secured with the expert.n Now one by one operators (A,B,C) will analyze the samples( Confirmed (C)/Not

Confirmed (N))

This activity will repeated thrice (Trial 3Nos)n

Data interpretations are reflected in following terms for each operator

Good Correct(1) ( Confirmed declared as confirm) Bad Correct(2) ( Non Confirmed declared as Non confirm) Total Correct(3)=(1+2) False Alarm(4) (Confirmed declared as No confirmed) Misses(5) (Non Confirmed declared as confirmed)

Grand Total (6)(No.of parts*No. of Trials)

Calculations:

1. Efficiency(E)= No. of Correct Decisions/Total Opportunity for decisions2. Probability of fail to detect nonconformity(P MISS)=No. of times that a piece is not has

been diagnosed/ Total opportunity for a decision(Non conformity)

3. False Alarm(P FA) =No. of times that correct part is rejected/ Total opportunity for adecision being rejected

n Calculate following values for each operator E= Total Correct/Grand Total P(Miss)= Misses/[Bad Correct + Misses] P(False)= False/[Good Correct+ False]


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Step II- Attribute Work Sheet

Operator Good

Correct(1)

Bad

Correct(2)

Total

Correct(3)

False

Alarm(4)

Misses(5) Grand

Total(6)A 26 23 49 7 4 60

B 32 20 52 1 7 60

C 26 24 50 7 3 60

Step II Calculations Base On Indicators

Operator E (3/6) P(F) 4/(1+4) P(MISS) 5/(2+5)

A 0.816 0.2121 0.148

B 0.866 0.030 0.259

C 0.833 0.21 0.11

Step IV- Interpretation

Operator A

E= 0.816

P(MISS)= 0.148

P(FA)= 0.2121

Comment: operator is marginally acceptable

Operator B

E= 0.866

P(MISS)= 0.259


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P(FA)= 0.030


Operator C

E= 0.833

P(MISS)= 0.11

P(FA)= 0.21


Step V: Analysis in case of P(F) & P(M) are at marginal level

n For Further analysis, if Operators P(F) & P(M) are at marginal level Calculate

n Tendency error b= P(F)/P(M)n Depending on the inferences, decisions for improving the system can be actioned upon.

Operator A:

b = 1.433

there is a willingness to reject parts

Operator B:

B = 0.11

There is willingness to accept parts


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Operator C:

B = 1.9

there is a willingness to reject parts

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Session 5 Grp 8 Ab1, Msa Attribute Worksheet