Answer the following questions according to the EWMA charts below: 1. What point

Question

Answer the following questions according to the EWMA charts 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?

6. Change the weight in the EMWA chart to 0.5, 1.0, 0.1, what do you notice?

Test Results for EWMA Chart of Weight TEST 1. One point more than 3.00 standard deviations from center line. Test Failed at points: 2, 3, 4, 5 *WARNING * If graph is updated with new data, the results above may no *longer be correct. EWMA Chart of Weight (default at 0.2) 955 UCL-950.99 950 945 940 X-936.89 935 930 925 LCL-922.79 920 Sample

Explanation / Answer

For EWMA chart of weight 0.2

1) Points for samples 2,3,4, 5 fall outside the control limits

2) Upper control limit (UCL) = 950.99

3) Lower control limit (LCL) = 922.79

4) Xbar = 936.89

5) We notice the control limits are not constant, but increase as the sample increase

6) We see that as the value of the smoothing constant increases, the control limits become more constant and become straight line when smoothing constant is 1.

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