Author Question: A quality control officer tests bottles of shampoo to see if the filling machines are putting the ... (Read 19 times)

laurencescou · **on:** Jul 24, 2018

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 2

Why does the sign test use a null hypothesis about the median instead of the mean like a t - test uses?

Carissamariew · **Reply #1 on:** Jul 24, 2018

Answer to Question 1

B

Answer to Question 2

The median is the middle value such that 50 of the distribution is larger in value and 50 is smaller in value.