Control charts-p-chart, Starbucks cashiers take thousands

Control charts-p-chart

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Reference no: EM13122339

Starbucks cashiers take thousands of orders each day. Samples of the accuracy in the orders are listed below. One hundred orders taken by each cashier were carefully examined and the number of errors counted. The faction defective in each sample was then computed. Set the control limits to include 99.88% of the random variation in the entry process when it is in control. Find the upper limit and lower limit. Draw the sample data on the control chart.

# orders errors % Order errors

Sample 1 8 0.08

Sample 2 9 0.09

Sample 3 10 0.10

Sample 4 2 0.02

Sample 5 8 0.08

Sample 6 7 0.07

Sample 7 8 0.08

Sample 8 9 0.09

Sample 9 4 0.04

Sample 10 7 0.07

Sample 11 6 0.06

Sample 12 1 0.01

Sample 13 8 0.08

Sample 14 5 0.05

Sample 15 6 0.06

Sample 16 7 0.07

Sample 17 16 0.16

Sample 18 4 0.04

Sample 19 5 0.05

Reference no: EM13122339

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