1-20chapter stats

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Unformatted text preview: subgroups of size four are being used to monitor the tire diameter size of a new radial tire manufactured by a tire company. The and R charts are found to be in statistical control with inches. A histogram of the tire diameter measurements indicates that distribution of these measurements is approximately normally distributed. Calculate the estimate of the percentage of tires that are out of specification. A. 1.93% B. 2.68% C. 1.62% D. 17.36% 1-1685 Chapter 01 - An Introduction to Business Statistics 99. Suppose that and R charts are based on subgroups of size four are being used to monitor the tire diameter size of a new radial tire manufactured by a tire company. The and R charts are found to be in statistical control with inches. A histogram of the tire diameter measurements indicates that distribution of these measurements is approximately normally distributed. Find the sigma level capability of the process. A. 1.93 B. 3.22 C. 0.64 D. 0.22 100. Among other quality measures, the quality of an electronic component used in manufacturing stereo speakers is monitored with a p-chart. In the last 25 days daily samples 60 units resulted in the following number of defective units per sample: 8, 4, 3, 7, 6, 2, 5, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5, 6, 0. Determine the center line for this process. A. .06 B. .03 C. .001 D. .056 101. Among other quality measures, the quality of an electronic component used in manufacturing stereo speakers is monitored with a control chart. In the last 25 days daily samples 60 units resulted in the following number of defective units per sample: 8, 4, 3, 7, 6, 2, 5, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5, 6, and 0. Determine the appropriate upper and lower control limits for this process. A. (.029 .091) B. (.056 .064) C. (0 .152) D. (0 .202) 1-1686 Chapter 01 - An Introduction to Business Statistics 102. The quality of an electronic component used in manufacturing cell phones is monitored with a p-chart. In the last 20 days daily samples of 75 units resulted in the following number of defective units per sample: 8, 4, 3, 7, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5 Find the appropriate center line. A. .0473 B. .2667 C. .1067 D. .0133 103. The quality of an electronic component used in manufacturing cell phones is monitored with a p-chart. In the last 20 days daily samples of 75 units resulted in the following number of defective units per sample: 8, 4, 3, 7, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5 Find the LCL and UCL for the p-chart A. (0 .1208) B. (.0228 .0718) C. (0 .1897) D. (.0445 .0501) 104. The quality of an electronic component used in manufacturing cell phones is monitored with a p-chart. In the last 20 days daily samples of 75 units resulted in the following number of defective units per sample: 8, 4, 3, 7, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5 If on the 21st day, 9 defective units were found in the sample of 75 units, would the process be in control? A. Yes B. No 1-1687 Chapter 01 - An Introduction to Business Statistics 105. Suppose that and R charts are based on subgroups of size four are being used to monitor the tire diameter size of a new radial tire manufactured by a tire company. The and R charts are found to be in statistical control with inches. A histogram of the tire diameter measurements indicates that distribution of these measurements is approximately normally distributed. Compute the natural tolerance limits for this process. A. (48.68 52.32) B. (49.89 51.11) C. (48.86 52.14) D. (46.75 54.25) 106. A motorcycle manufacturer produces the parts for its vehicles in different locations and transports them to it plant for assembly. In order to keep the assembly operations running efficiently, it is vital that all parts be within specification limits. One important part used in the assembly is the engine camshaft and one important quality characteristic is the case hardness depth. Specifications state that the hardness depth must be between 3.0 mm and 6.0 mm. To investigate the process, the quality control engineer selected 25 daily subgroups of n = 5 and measured the hardness depth. The process yielded a mean of the means = 4.50 and an average range = 1.01. Calculate the center line for the X-bar chart. A. 1.01 B. 4.50 C. 3.49 D. 0.90 107. A motorcycle manufacturer produces the parts for its vehicles in different locations and transports them to it plant for assembly. In order to keep the assembly operations running efficiently, it is vital that all parts be within specification limits. One important part used in the assembly is the engine camshaft and one important quality characteristic is the case hardness depth. Specifications state that the hardness depth must be between 3.0 mm and 6.0 mm. To investigate the process, the quality control engineer selected 25 daily subgroups of n = 5 and measured the hardness depth. The process yielded a mean of the means = 4.50 and an average range = 1.01. Calculate the center line for the R chart. A. 1.01 B. 0.22 C. 4.50 D. 0.90 1-1688 Chapt...
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This document was uploaded on 01/20/2014.

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