The Central Line on a P- Chart Is 0

Multiple Choice

The central line on a p- chart is 0.50 with an UCL of 0.65 and a LCL of 0.35. The results of the next six samples are 0.60, 0.37, 0.45, 0.48, 0.53, and 0.62. What should you do?

A) Explore the assignable causes because three observations are above the central line.
B) Explore assignable causes because there is a run.
C) Increase the sample size to get a better measure.
D) Nothing; the process is behaving as expected.