3121ChartsData

3121ChartsData - Fraction (or proportion) Defective 1. 4...

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X-bar and R Chart Example Data Response times to “Hot Line” N= 10 calls per day 5 samples __ Sample# X R 1. 15.2 1.6 2. 14.9 1.9 3. 15.3 1.6 4. 14.7 2.6 5. 15.1 2.8 75.2 10.5 Grand Mean: 15.04 Average Range: 2.1 (75.2/5) (10.5/5) __ X Chart UCL = Grand Mean + (A 2 *Avg. Range) = 15.04 + (.308*2.1) = 15.69 LCL = Grand Mean - (A 2 *Avg. Range) = 15.04 - (.308*2.1) = 14.39 R Chart UCL = D 4 * Avg. Range = 1.777 *2.1 = 3.73 LCL = D 3 * Avg. Range = 0.223 * 2.1 = 0.47
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p Chart Example Data “Was the Front desk staff courteous?” N= 30 guests per week 5 samples Sample# Number Defective
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Unformatted text preview: Fraction (or proportion) Defective 1. 4 .13 2. 2 .07 3. 3 .10 4. 2 .07 5. 4 .13 15 Average Proportion Defective = Total # defective / Total # of guests sampled = 15/150 = .10 Standard deviation = Sq. Root of [(Avg. Prop. Defective * (1- Avg. Prop. Defective))/ Sample size] = Sq. Root of [ (.1*.9)/30] = .05 UCL = Average Proportion Defective + Z * Standard deviation = .1 + (3*.05) = .25 LCL = Average Proportion Defective - Z * Standard deviation = .1 - (3*.05) = -.05 = (0) Chart is not symmetrical...
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This note was uploaded on 04/22/2011 for the course MGMT 3121 taught by Professor Das during the Spring '11 term at CUNY Baruch.

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3121ChartsData - Fraction (or proportion) Defective 1. 4...

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