Answer the following questions according to the provided Shewhart chart below: 1

Question

Answer the following questions according to the provided Shewhart chart below:

1. What points fall outside the control limits? ________________________________________    

2. What is the upper control limit? __________________

3. What is the lower control limit? ___________________

4. What is xbar? ___________________

5. What do you notice about the control limits?

I-MR Chart of Weight Test Results for I Chart of Weight TEST 1. One point more than 3.00 standard deviations from center line. Test Failed at points: 14, 23, 30, 31, 44, 45 1050 UCL-1010.9 1000 D 950 X 936.9 900 LCL-862.8 1. 1. 850 1 5 9 3 21 25 29 33 37 41 45 Observation

Explanation / Answer

1.4 points lying above UCL are outside control limit.

2.UCL is 1010.9

3.LCL is 862.8

4.X bar = 936.9.The X-bar chart shows how the mean or average changes over time.

5.Control limits are used to define acceptable quality. Units falling outside these limits are unacceptable and will be rejected .So units that fall within the specification limits are only defect free.observations will fall somewhere between 3 standard deviations below the mean (-3?) and 3 standard deviations above the mean (+3?). This principle is used to set control limits.

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