1-20chapter stats

The process yielded a mean of the means 450 and an

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Unformatted text preview: 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 1-1691 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) 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 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 measurements are periodically taken at four different locations on the window. 15 subgroups were observed and each subgroup consists of the four thickness measurements taken across the windows at a particular time with the following results: mean of the means = and the average range of 8.85. Calculate the center line for the X-bar chart. A. 50.05 B. 8.85 C. 4.12 D. 3.34 1-1692 = 50.05 Chapter 01 - An Introduction to Business Statistics 118. 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 measurements are periodically taken at four different locations on the window. 15 subgroups were observed and each subgroup consists of the four thickness measurements taken across the windows at a particular time with the following results: mean of the means = = 50.05 and the average range of 8.85. Calculate the center line for the R chart. A. 50.05 B. 8.85 C. 2.21 D. 0.59 119. 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 measurements are periodically taken at four different locations on the window. 15 subgroups were observed and each subgroup consists of the four thickness measurements taken across the windows at a particular time with the following results: mean of the means = and the average range of 8.85. Calculate the control limits for the X-bar chart. A. (41.2 58.9) B. (48.1 52.0) C. (43.6 56.5) D. (29.9 70.2) 1-1693 = 50.05 Chapter 01 - An Introduction to Business Statistics 120. 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 measurements are periodically taken at four different locations on the window. 15 subgroups were observed and each subgroup consists of the four thickness measurements taken across the windows at a particular time with the following results: mean of the means = = 50.05 and the average range of 8.85. Calculate the control limits for the R chart. A. (3.07 14.63) B. (6.57 11.13) C. (0 35.40) D. (0 20.20) 121. 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 measurements are periodically taken at four different locations on the window. 15 subgroups were observed and each subgroup consists of the four thickness measurements taken across the windows at a particular time with the following results: mean of the means = = 50.05 and the average range of 8.85. Assuming that the process is in statistical control, calculate the natural tolerance limits for the process. A. (45.75 54.35) B. (37.16 62.94) C. (42.40 57.70) D. (47.50 52.60) 122. A manufacturer of windows produces one type that has a plastic co...
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This document was uploaded on 01/20/2014.

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