A p chart is to be developed for use in quality control.The value of p is calculated to be 0.04.The sample size is 100.What would the lower control limit be?
A)0.000
B)0.059
C)0.019
D)0.031
E)-0.019

Question

Quizplus · Accepted Answer

The lower control limit (LCL) for a p-chart is calculated using the formula: LCL = p - 3 * sqrt[(p(1-p))/n]. Substituting the given values: LCL = 0.04 - 3 * sqrt[(0.04(1-0.04))/100] = 0.04 - 3 * sqrt[0.0384/100] = 0.04 - 3 * 0.0196 = 0.04 - 0.0588 = 0.000 (since LCL cannot be negative).

A P Chart Is to Be Developed for Use in Quality