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= 0.05 The average weight of castings produced at the Nebraska foundry is 3.7 lbs. A new supplier from Kansas has submitted a batch of castings known to have normally distributed weights. A random sample of 10 has an average weight of 3.6 lbs. and standard deviation 0.06 lbs. Do these data indicate that the Kansas foundry produce lighter castings on average?
A. yes
B. no
ANSWER : A
An automatic gaging system is to be installed in a process. The gage will insert data values into a data base from which machine adjustments will be made automatically. A critical factor in specifying the equipment is:
A. communication link between gage and computer
B. compatibility of software in the gage and in the computer
C. adequate manual over-rides
D. all of the above
ANSWER : D
A population of size 1,000,000 has mean 42 and standard deviation 6. Sixty random samples, each of size 15 are selected. According to the Central Limit Theorem the distribution of the sixty sample means has a standard deviation of approximately:
A. 6
B. 6/42
C. 6/15
D. 6/ 15
E. none of the above
ANSWER : D
A frequent cause of system sub optimization is:
A. optimizing individual processes
B. failing to draw a system flow chart
C. using data with outliers
D. failing to consider the normal distribution
ANSWER : A
A Six Sigma project designed to solve a particular problem needs a definition/scope statement to help avoid:
A. going beyond the problem into other problems
B. failing to cover the entire problem
C. misunderstanding and disagreement between team members regarding problem boundaries
D. all of the above
E. none of the above
ANSWER : D