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MBA, Ph.D in Management
Harvard university
Feb-1997 - Aug-2003
Professor
Strayer University
Jan-2007 - Present
Use the data in Worksheet named Q20.
1)     A local delivery service is contracted to deliver 50 packages every day. The data in Excel file shows the number of packages that were late each day for a 30-day period. What is the upper control limit?
A.   0.33
B.    0.025
C.    0.109
D.   -0.043
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Use data provided in the Worksheet named Q21.
2)Â Â Â Â Â A local restaurant has customers fill out a rating/comment card at the time of payment. It shows the number of negative comments the restaurant received over a 14-day period. What are the upper and lower control limits?
A.   1.93, -2.24
B.    5.79, 0 (does not exist)
C.    6.09, -2.24
D.   6.09, 0 (does not exist)
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Use the following information and data in Excel Worksheet Q22-24 to answer Q22 – Q24.
The data is collected from a breakfast cereal production line. X-bar and R charts were constructed with the data. Filled cereal boxes were weighed each hour for 8 hours. In each sample 10 boxes were weighed. The mean and range for each sample was computed and recorded. Use the data supplied for these cases to answer questions 22, 23 and 24.
3)Â Â Â Â Â What are the upper and lower control limits of the Range chart?
A.   0.41, 0.05
B.    15.21, 14.79
C.    0.43, 0.03
D.   15.09, 14.95
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4)Â Â Â Â Â What are the UCL and LCL for the X-bar chart?
A.   0.41, 0.05
B.    15.21, 14.79
C.    0.43, 0.03
D.   15.09, 14.95
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5)Â Â Â Â Â ASSUMEÂ that UCL and LCL were calculated to be 0.67and 0.01 for the range chart and the UCL and LCL were calculated to be 15.06 and 14.75 for the mean chart. What could be said about the packaging process?
A.   Both the process mean and process variability are in statistical control
B.    The process mean is in statistical control but the process range is not
C.    The process range is in statistical control but the process mean is not
D.   Both the process mean and range are out of statistical control
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