40 samples of size 2,500 were taken from a production process that is under control.The mean of the sample proportions of defectives was .05.The lower control limit for the 3-sigma p chart is .0369.

Question

Quizplus · Accepted Answer

To calculate the lower control limit for a p chart, we use the formula: 
LCL = p̄ - 3√(p̄(1-p̄)/n)
where p̄ is the mean of the sample proportions, n is the sample size (in this case, n=2,500), and LCL is the lower control limit.

Plugging in the given values: 
LCL = 0.05 - 3√[ 0.05(1-0.05)/2500 ]
LCL ≈ 0.0369

So the given lower control limit of 0.0369 is correct, and the answer is A - True.

40 Samples of Size 2,500 Were Taken from a Production