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  3. a high-level voltage power supply should have a no

A high-level voltage power supply should have a nominal output voltage of 350 V. A sample...

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Statistics

  1. A high-level voltage power supply should have a nominal outputvoltage of 350 V. A sample of four units is selected each day andtested for process-control purposes. The data (20 days, 1sample/day) shown in the table below give the difference betweenthe observed reading on each unit and the nominal voltage timesten; that is, xi = (observed voltage on unit350)*10.

Voltage Data

Voltage Data

Sample #

xi

Sample #

xi

1

6

11

8

1

9

11

12

1

10

11

14

1

15

11

16

2

10

12

6

2

4

12

13

2

6

12

9

2

11

12

11

3

7

13

16

3

8

13

9

3

10

13

13

3

5

13

15

4

8

14

7

4

9

14

13

4

6

14

10

4

13

14

12

5

9

15

11

5

10

15

7

5

7

15

10

5

13

15

16

6

12

16

15

6

11

16

10

6

10

16

11

6

10

16

14

7

16

17

9

7

10

17

8

7

8

17

12

7

9

17

10

8

7

18

15

8

5

18

7

8

10

18

10

8

4

18

11

9

9

19

8

9

7

19

6

9

8

19

9

9

12

19

12

10

15

20

13

10

16

20

14

10

10

20

11

10

13

20

15

  1. Calculate the UCL and LCL for the x̄-chart.
  2. Calculate the UCL and LCL for the R-chart.
  3. Set up x̄ and R charts on this process. Is the processin statistical control?
  4. If specifications are at 350 V ± 5 V, what can you say aboutprocess capability? Calculate Cp. Interpret thecalculated value of Cp.
  5. Calculate Cpk. Interpret the calculated value ofCpk.

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