When a process is in control, it results in there being, on average, 16 defects per unit of output. c-chart limits of 4 and 28 would lead to a _______ percent chance of a Type I error.
A) 67
B) 92
C) 33
D) 0.3
E) 5

Question

Quizplus · Accepted Answer

The probability of a Type I error is the probability of rejecting the null hypothesis when it is true. In this case, the null hypothesis is that the process is in control, and the alternative hypothesis is that the process is out of control. The c-chart limits are 4 and 28, which means that if the number of defects per unit of output is less than 4 or greater than 28, then the process is considered to be out of control. The probability of a Type I error is the probability of getting a sample that is less than 4 or greater than 28 when the process is actually in control. This probability is 0.3%.

When a Process Is in Control, It Results in There