engineering 19

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Q1- (Acceptance Sampling Questions) A real estate firm evaluates incoming selling agreement forms using the single sampling plan N = 1500, n = 110, and c = 3. By completing the table, construct the OC curve using about 7 points? (50 points)

Assumed Process Quality

Sample Size

Average nonconforming

Prob. of Acceptance

Percent of Lots accepted

P0

100P0

n

nP0

Pa

100Pa

0.01

110

0.02

110

0.03

110

0.04

110

0.05

110

0.06

110

0.07

110

Q2- (Probability & Distribution Model Question) The lifetime of a system has a Normal Distribution with µ=6 years and σ=1.2 years. What is the probability the life time exceed 5.028 years (Round up to 3 digits)? (50 points)

Q3- (Attribute Chart Question) Surface defects have been counted on 25 rectangular steel plates, and the data are shown in Table below. Set up a control chart for nonconformities using these data. Does the process producing the plates appear to be in statistical control? (50 points)

Plates#

No. of Defects

Answer:

Chart:

Conclusion:

1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

0

4

3

1

2

5

0

2

1

1

0

8

0

2

1

3

5

4

6

3

1

0

2

4

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