The control limits for p-charts are found using ________.
A) ± s
B) ± 3s
C) ± 3p
D) ± 3x

Question

The control limits for p-charts are found using ________.
A) ± s 
B) ± 3s 
C) ± 3p 
D) ± 3x

Quizplus · Accepted Answer

The control limits for p-charts are found using the formula p̂ ± 3√(p̂(1-p̂)/n), where p̂ is the sample proportion and n is the sample size. This corresponds to choice B, which has the format of mean ± 3s, where s is the standard deviation of the sample proportion. The other choices do not use the correct formula for p-charts.

The Control Limits for P-Charts Are Found Using ________