When a process is in control, it results in there being, on average, 16 defects per unit of output. c-chart limits of 8 and 24 would lead to a _____ percent chance of a Type I error.
A)68.26
B)95.44
C)31.74
D)0.26
E)4.56

Question

Quizplus · Accepted Answer

A Type I error occurs when a process is in control, but the control chart indicates it is out of control. The c-chart limits of 8 and 24 are set at ±2 standard deviations from the mean (16 defects), which corresponds to a 95.44% confidence interval. Therefore, the probability of a Type I error is 100% - 95.44% = 4.56%.

When a Process Is in Control, It Results in There