Question: QUESTION 4 Control charts are to be established on a certain dimension part, measured in millimetres. Data were collected in subgroup sizes of 4 and

QUESTION 4

Control charts are to be established on a certain dimension part, measured in millimetres. Data were collected in subgroup sizes of 4 and are given below:

Date Time X1 X2 X3 X4
11-Mar-21 08h00 24 23 24 21
11h00 38 24 25 26
14h00 25 26 27 22
17h00 29 22 25 21
19h00 31 20 27 25
12-Mar-21 08h00 19 29 30 25
11h00 26 24 24 25
14h00 22 27 21 22
17h00 18 23 25 19
19h00 23 22 28 32
13-Mar-21 08h00 22 20 29 30
11h00 22 21 22 26
14h00 28 29 24 25
17h00 25 32 21 21
19h00 28 31 24 22
14-Mar-21 08h00 15 25 29 28
11h00 18 28 29 25
14h00 20 25 28 20
17h00 19 24 31 31
19h00 26 24 32 30

4.1. What is the process mean? 4.2. What is the process standard deviation (use both methods)? 4.3. Construct a three-sigma control chart for and R charts. 4.4. Construct a three-sigma control chart for and S charts. 4.5. What conclusions can you draw about the ability of the process

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