The Center Line (P-Bar) for a P-Chart Is 0

question 67

Multiple Choice

The center line (p-bar) for a p-chart is 0.50 with an ULC = 0.70 and a LCL = 0.35. The results of the next eight sample means are 0.45, 0.60, 0.39, 0.44, 0.48, 0.58, 0.54, and 0.64. Which of the following actions should be taken in this scenario?

• A) Nothing-the process is in control.
• B) Investigate assignable causes because four observations are above the center line.
• C) Investigate assignable causes because there is a bad trend (run).
• D) Investigate assignable causes because four of the eight samples are below the center line.