Forty samples of 100 are taken, with the total number of defective units being 150.
-Calculate the lower control limit for the chart, using z = 3.
A)0.0375
B)0.0190
C)0.0945
D)0.0000
E)0.0150

Question

Quizplus · Accepted Answer

The lower control limit (LCL) for a p-chart is calculated using the formula: LCL = p̄ - z * sqrt((p̄(1-p̄)/n)), where p̄ = total defectives/total samples = 150/(40*100) = 0.0375. However, if the calculated LCL is negative, it is set to 0. In this case, the calculated LCL is negative, so it is set to 0.

Forty Samples of 100 Are Taken, with the Total Number