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 11691 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 pchart.
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 Xbar chart.
A. 50.05
B. 8.85
C. 4.12
D. 3.34 11692 = 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 Xbar chart.
A. (41.2 58.9)
B. (48.1 52.0)
C. (43.6 56.5)
D. (29.9 70.2) 11693 = 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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