A government testing agency studies aspirin capsules to see if customers are getting cheated with capsules that contain lesser amounts of medication than advertised. Suppose the testing agent concludes the capsules contain a mean amount below the advertised level when in fact the advertised level is the true mean. Which type of error, if any, did the testing agency 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

A Type I error occurs when the null hypothesis is rejected when it is actually true. In this scenario, the null hypothesis would be that the mean amount of medication in the capsules is equal to the advertised level. Rejecting this hypothesis when it is true (concluding the capsules contain less medication than advertised when they actually contain the advertised amount) is a Type I error.

A Government Testing Agency Studies Aspirin Capsules to See If