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Unformatted text preview: mportant 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. Is the process capable of meeting the specifications? A. Yes B. No Yes, the process is capable because the natural tolerance limits are within the specifications. AACSB: Analytic Bloom's: Analysis Difficulty: Medium Learning Objective: 6 Topic: Process capability 1-1750 Chapter 01 - An Introduction to Business Statistics 112. 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. Find the sigma level capability of the process. A. 3.45 B. 0.45 C. 1.24 D. 1.49 Zusl = (6 - 4.5)/(1.01/2.326) = 3.45 Zlsl = (3 - 4.5)/(1.01/2.326) = -3.45 Sigma level capability = min [|3.45|, |-3.45|] = 3.45 AACSB: Analytic Bloom's: Application Difficulty: Hard Learning Objective: 6 Topic: Process capability 1-1751 Chapter 01 - An Introduction to Business Statistics 113. 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. How many standard deviations of leeway exist between x and the specification closest to x? A. 1.76 B. 1.51 C. 2.55 D. 0.45 Sigma level capability - 3 = 3.45 - 3 = 0.45 AACSB: Analytic Bloom's: Application Difficulty: Hard Learning Objective: 6 Topic: Process capability 114. A bank officer wishes to study how many customers write bad checks. To accomplish this, the officer randomly selects a weekly sample of 100 of checking accounts, and the number of who wrote bad checks was recorded. The numbers of customers who wrote bad checks in 20 consecutive weekly samples of 100 cardholders are, respectively, 1, 4, 9, 0, 4, 6, 0, 3, 8, 5, 3, 5, 2, 9, 4, 4, 3, 6, 4, 0 Find the appropriate center line. A. .08 B. .01 C. .09 D. .04 AACSB: Analytic Bloom's: Application Difficulty: Medium Learning Objective: 7 Topic: P-Chart Control Charts 1-1752 Chapter 01 - An Introduction to Business Statistics 115. A bank officer wishes to study how many customers write bad checks. To accomplish this, the officer randomly selects a weekly sample of 100 of checking accounts, and the number of who wrote bad checks was recorded. The numbers of customers who wrote bad checks in 20 consecutive weekly samples of 100 cardholders are, respectively, 1, 4, 9, 0, 4, 6, 0, 3, 8, 5, 3, 5, 2, 9, 4, 4, 3, 6, 4, 0 Find the LCL and UCL for the p-chart. A. (.0204 .0596) B. (.034 .046) C. (0 .0988) D. (0 .171) → 0 to .0988 AACSB: Analytic Bloom's: Application Difficulty: Medium Learning Objective: 7 Topic: P-Chart Control Charts 116. A bank officer wishes to study how many customers write bad checks. To accomplish this, the officer randomly selects a weekly sample of 100 of checking accounts, and the number of who wrote bad checks was recorded. The numbers of customers who wrote bad checks in 20 consecutive weekly samples of 100 cardholders are, respectively, 1, 4, 9, 0, 4, 6, 0, 3, 8, 5, 3, 5, 2, 9, 4, 4, 3, 6, 4, 0 On the basis of the limits established, if the bank finds that 12 customers in next week's sample of 100 cardholders have written bad checks, should the bank believe that there has been an unusual variation in the process? A. Yes B. No Yes, there would be unusual variation because is outside the UCL AACSB: Analytic Bloom's: Comprehension Difficulty: Medium Learning Objective: 7 Topic: P-Chart Control Charts 1-1753 Chapter 01 - An Introduction to Business Statistics 117. A manufacturer of windows produces one type that has a plastic coating. The specification limits for the plastic coating are 30 and 70. From time to time the plastic coating can become uneven. Therefore, in order to keep the coating as even as possible, thickness measurem...
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