ISS Statistics Paper IV: Questions 20 - 21 of 79

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Question number: 20

» Statistical Quality Control » Control Charts » Attributes

Essay Question▾

Describe in Detail

The following are figures of defective bulbs in 10 lots each containing 30 bulbs. Construct 3-σ control limits for the p-chart.

Construct 3 sigma control limit for p-chart

What is the 3 sigma control limit for p-chart

Sample

No. of defective (d)

1

1

2

3

3

3

4

1

5

0

6

5

7

1

8

1

9

1

10

1

Explanation

We have n = 30 pi=di30(i=1,2,,30)

Construct 3 sigma control limit for p-chart Finding Defectives

What is the 3 sigma control limit for p-chart

Sample

No. of defective (d)

pi=di… (168 more words) …

Question number: 21

» Statistical Quality Control » Control Charts » Variable

Essay Question▾

Describe in Detail

Obtain the control limits for X¯charts for the following data of 25 samples with 4 observations on the basis of volume of the bottles filled.

Given are observations find control limits for X bar Chart

Given are observations find control limits for X bar Chart

Sample No.

Observations

Sample No.

Observations

1

15.85

16.02

15.83

15.93

13

15.85

15.76

15.74

15.98

2

16.12

16.00

15.85

16.01

14

15.73

15.84

15.96

16.10

3

16.00

15.91

15.94

15.83

15

16.20

16.01

16.10

15.89

4

16.20

15.85

15.74

15.93

16

16.12

16.08

15.83

15.94

5

15.74

15.86

16.21

16.10

17

16.01

15.93

15.81

15.68

6

15.94

16.01

16.14

16.03

18

15.78

16.04

16.11

16.12

7

15.75

16.21

16.01

15.86

19

15.84

15.92

16.05

16.12

8

15.82

15.94

16.02

15.94

20

15.92

16.09

16.12

15.93

9

16.04

15.98

15.83

15.98

21

16.11

16.02

16.00

15.88

10

15.64

15.86

15.94

15.89

22

15.98

15.82

15.89

15.89

11

16.11

16.00

16.01

15.82

23

16.05

15.73

15.73

15.93

12

15.72

15.85

16.12

16.15

24

16.01

16.01

15.89

15.86

25

16.08

15.78

15.92

15.98

Explanation

Given are observations finding correct control limits for X bar Chart

Given are observations finding right control limits for X bar Chart

Sample No.

Observations

Total

Sample Mean (X¯)

1

15.85

16.02

15.83

15.93

63.63

15.91

2

16.12

16.00

15.85

16.01

63.98

16.00

3

16.00

15.91

15.94… (279 more words) …

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