A quality control officer tests bottles of shampoo to see if the filling machines are putting the proper amount in each bottle. They do not want to shut down production unless there is strong evidence indicating that the machines are not functioning properly. After testing a sample of bottles, the quality control officer decides to leave the filling machines operating. Actually, however, the filling machines are not operating properly. Which type of error, if any, did the quality control officer commit?
A) This is a Type I error.
B) This is a Type II error.
C) This is a Type O error.
D) This is a correct decision.
E) Need more information to answer this question.

Question

Quizplus · Accepted Answer

The quality control officer made a Type II error by failing to detect that the filling machines were not operating properly. This means that they accepted a false null hypothesis (that the machines were functioning properly) when it was actually false.

A Quality Control Officer Tests Bottles of Shampoo to See