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six_sigma_chart_is_solved

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Objective: Your Black Belts developed the following data and created this control chart for sandwich preparation times. They say that the process is stable and shows that the average prep time is 1.7512 minutes and that individual prep times will not exceed 1.9205 minutes. They also say that it's very good because it shows very little variation. Instructions for you: Part I Do you agree with their interpretation? (see chart below) HINT: Use the 11 Shewhart Rules for Stability as the basis for your decision. Data: I-MR Chart for Current Sandwich Prep Times +3S L=1.9205 Individual Value 1.9 +2S L=1.8640 1.8 +1S L=1.8076 _ X=1.7512 1.7 -1S L=1.6947 -2S L=1.6383 1.6 -3S L=1.5818 1 3 5 7 9 11 O bser vation 13 15 17 19 +3S L=0.2080 M oving Range 0.20 +2S L=0.1599 0.15 +1S L=0.1118 0.10 __ M R=0.0637 0.05 -1S L=0.0156 -3S L=0 -2S 0.00 1 3 5 7 9 11 O bser vation 13 15 17 19 Current Sandwich Prep Times (in minutes) 1.6434 1.8623 1.7611 1.7049 1.7888 1.7469 1.8223 1.7793 1.7122 1.7562 1.6798 1.7013 1.7750 1.7400 1.8122 1.7778 1.7233 1.7410 1.7143 1.7807 Part II You and your team work to eliminate all known assignable causes from this process. You think you have accomplished this and collect the following data on the new process. Calculate the control chart center line and control limit values for an I-MR chart and use the 11 Shewhart Rules for Stability to determine if this process is now stable. Revised Process Prep Times (in minutes) 1.5364 1 ...
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