A quality control officer tests bottles of shampoo to see if the filling machines are putting the proper amount in each bottle. After testing a sample of bottles, the quality control officer decides to leave the filling machines operating. 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 correct decision.
D) This is an incorrect decision.

Question

Quizplus · Accepted Answer

The quality control officer made a Type II error, which means they failed to reject the null hypothesis (i.e. the filling machines are putting the proper amount in each bottle) when it was actually false (i.e. the filling machines are not operating properly). This can lead to a high risk of producing defective products since the machines are not filling the bottles properly.

A Quality Control Officer Tests Bottles of Shampoo to See