Consider a production process that produces tires. A quality engineer has taken 15 samples, each containing 200 tires. The total number of defective tires over the 15 samples is 340. The centerline for the control chart is
A) 0.08
B) 0.11
C) 0.16
D)0.21

Question

Quizplus · Accepted Answer

The centerline for a p-chart is calculated as the overall proportion of defects in the process. In this case, the overall proportion of defective tires is calculated as (340/15*200) = 0.1133 or 0.11 (rounded to two decimal places). Therefore, the centerline for the control chart is 0.11. Hence the correct choice is B.

Consider a Production Process That Produces Tires