Quiz 4 Solutions

Quiz 4 Solutions - bearing is measured Employees have taken...

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Name Circle Section Time: 9:30 11 BUSQOM 1070 Quiz 4 Spring 2011 1. The Western Jeans Company produces denim jeans. The company wants to establish a control chart to monitor the production process and maintain high quality. Western believes that approximately 99.74% of the variability in the production process is random and thus should be within control limits. The company has taken 20 samples (one per day for 20 days), each containing 100 pairs of jeans, and inspected them for defects. The results are shown below: Sample 5 2 - 4 5 6 s 9 " 11 L2 13 1 i 15 [6 ; . ;S - 20 Number of Defectives Proport 6 0 1 i| 6 1 1 2 If . > 10 '.'. 10 11 s 1- 16 12 14 20 18 200 ::i- .04 .'0 .06 .'U .12 li' .:•> .10 ..'i .14 i iv 16 14 .20 . N What type of control chart is appropriate here? What are the upper and lower control limits? IACL- LCL - PageioTZ <r ~ * 0.0$
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2. The Goliath Tool Company produces slip-ring bearings, which look like washers. At any early stage in the production process for a particular slip-ring bearing, the outside diameter of the
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Unformatted text preview: bearing is measured. Employees have taken 10 samples (during a 10-day period) of 5 slip-ring bearings and measured the diameter of the bearings. The individual bearings from each sample are shown as follows: Observations (Slip-Ring Diameter, cm), n Subgroup k 1 2 3 4 5 6 7 8 9 10 1 .-.('•_! 5.01 4.99 5.03 4.95 4.97 5.05 5.09 5.14 5.01 2 5.01 5.03 5.00 4.91 4.92 5.06 5.01 5.10 5.10 4.98 3 4.94 5.07 4.W 5.01 5.03 5.06 5.10 5.00 4,99 5.08 4 4.99 4.95 4.92 4.98 5.05 4.96 4.96 4.99 5.08 5.07 .5 4.96 4.96 4.99 4.89 5.01 5.03 4.99 5.08 5.09 4.99 X 4.98 5.00 4.97 4.96 4.99 5.01 5.02 5.05 5,08 5.03 50.09 It is known that the process standard deviation is 0.08. The company wants to develop a control chart with 3-sigma limits to monitor this process in the future. What type of control chart is appropriate here? What are the upper and lower control limits?-5,11? tct--tf, 101* Page 2 of 2...
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This note was uploaded on 05/13/2011 for the course BUSORG 1070 taught by Professor Scala during the Spring '11 term at Pittsburgh.

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Quiz 4 Solutions - bearing is measured Employees have taken...

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