The Watson Electric Company produces incandescent light bulbs. The following data on the number of lumens for 40-watt light bulbs were collected when the process was in control. The standard deviation of the process is 15.Calculate control limits for an x-bar chart with 3-sigma limit and draw the chart.Since these data were collected, some new employees were hired. A new sample obtained the following readings: 625, 592, 612, and 650. Is the process still in control? 1 uit pivtss 1S IJ.ObservationsSample1 2| 3416046125886002597601607603358157058559246206055955885590614608604

Given, Standard deviation of the process = 15 Sample size n = 4 At n=4, A2 = 0.729

Answered: Calculate control limits for an x-bar…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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The Watson Electric Company produces incandescent light bulbs. The following data on the number of lumens for 40-watt light bulbs were collected when the process was in control. The standard deviation of the process is 15.

Calculate control limits for an x-bar chart with 3-sigma limit and draw the chart.
Since these data were collected, some new employees were hired. A new sample obtained the following readings: 625, 592, 612, and 650. Is the process still in control?