Question
A manufacturing process produces steel rods in batches of 2,200. The firm believes that the percent...
A manufacturing process produces steel rods in batches of 2,200. The firm believes that the percent of defective items generated by this process is 4.3%.
a. Calculate the centerline, the upper control limit (UCL), and the lower control limit (LCL) for the p¯p¯ chart. (Round your answers to 3 decimal places.)
centerline-
Upper control limit-
Lower control limit-
b. An engineer inspects the next batch of 2,200 steel rods and finds that 5.5% are defective. Is the manufacturing process under control?
A)Yes, because the sample proportion lies within the control limits.
B)Yes, because the sample proportion lies below the lower control limit.
C)No, because the sample proportion lies between the upper and lower control limits.
D)No, because the sample proportion lies below the lower control limit.
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