In constructing a p-chart where the average proportion defective rate is 8 percent and the sample...
In constructing a p-chart where the average proportion defective rate is 8 percent and the sample size is 50, what is the standard deviation?
a) 1.6
b) 0.0732
c) 0.0384
d) 3.84
Homework Answers
The standard deviation for constructing a p-chart is calculated as -
σp = √pbar(1-pbar)/n
where, pbar is the average proportion defective = 0.08
n is the sample size = 50
=> σp = √pbar(1-pbar)/n = √0.08(1-0.08)/50 = 0.0384
Hence, option (c) is correct choice
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