Question: A Quality Analyst wants to construct a p chart for determining whether four machines, all producing the same product, are under control with regard to
A Quality Analyst wants to construct a p chart for determining whether four machines, all producing the same product, are under control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results:
MachinenNumber of Defectives #11,00023 #21,00015 #31,00029 #41,00013
What is the average proportion defective?
A. 0.01
B. 0.02
C. 0.04
D. 0.06
E. 0.08
What is the standard deviation of the sampling distribution of sample proportion defective?
A. 0.016
B. 0.014
C. 0.04
D. 0.0044
E. 0.07
What upper and lower control limits would give a 5% alpha risk?
A. 0.0272 and 0.0128
B. 0.0286 and 0.0114
C. 0.029 and 0.013
D. 0.1572 and 0
E. 0.0332 and 0.0068
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