Module 4-7

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School

University of Arkansas, Little Rock *

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MISC

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Industrial Engineering

Date

Dec 6, 2023

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docx

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Question 7 1 / 1 pts A quality control analyst for a lightbulb manufacturer is concerned that the time it takes to produce a batch of lightbulbs is too erratic. Accordingly, the analyst randomly surveys 5 production periods each day for 8 days and records the sample mean and range for each day. The data is presented in the table below. Referring to the table, suppose the analyst constructs an X-Bar chart to see if the production process is in control. What are the upper control limit (UCL) and the lower control limit (LCL) for this chart? Day X- Bar R 1 13.6 3.5 2 14.3 4.1 3 15.3 5.0 4 12.6 2.8 5 11.8 3.7 6 12.9 4.8 7 17.3 4.5 8 15.8 2.4 Total 113.6 30.8 14.20 and 3.85 15.64 and 12.76 16.42 and 11.98 15.39 and 12.03

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Module 4-7

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