Estimate the process mean and standard deviation

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1. The net weight of a soft drink is to be monitored by X‾ and R control charts using a sample size n = 5. Data for 20 preliminary samples are shown in Table below.

Sample Number

X1

x2

x3

X4

x5

 

15.8

16.3

16.2

16.1

16.6

2

16.3

15.9

15.9

16.2

16.4

3

16.1

16.2

16.5

16.4

16.3

4

16.3

16.2

15.9

16.4

16.2

5

16.1

16.1

16.4

16.5

16.0

6

16.1

15.8

16.7

16.6

16.4

7

16.1

16.3

16.5

16.1

16.5

8

16.2

16.1

16.2

16.1

16.3

9

16.3

16.2

16.4

16.3

16.5

10

16.6

16.3

16.4

16.1

16.5

11

16.2

16.4

15.9

16.3

16.4

12

15.9

16.6

16.7

16.2

16.5

13

16.4

16.1

16.6

16.4

16.1

14

16.5

16.3

16.2

16.3

16.4

15

16.4

16.1

16.3

16.2

16.2

16

16.0

16.2

16.3

16.3

16.2

17

16.4

16.2

16.4

16.3

16.2

18

16.0

16.2

16.4

16.5

16.1

19

16.4

16.0

16.3

16.4

16.4

20

16.4

16.4

16.5

16.0

15.8

a. Set up X‾ and R control charts using these data. Does the process exhibit statistical control?

b. Estimate the process mean and standard deviation.

c. Does fill weight seem to follow a normal distribution?

2. Rework Exercise 4 using an X‾-S chart.

a. Set up X‾ and S control charts. Is the process in statistical control?

b. Estimate the process mean and standard deviation. (σ^ = s‾/c4)

c. What are the limits that you would expect to contain nearly all the process measurements?

Reference no: EM131876595

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