Testing:
$H 0: u \geq 13.9$
H1:u< 13.9
Suppose you mistakenly failed to reject the null hypothesis in this problem, what type of error is that ?y

Answer

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Answer

The type of error that occurs in this case is a $\boxed{\text{Type II error}}$.

Steps

Step 1 ：We are testing the following hypotheses: Null Hypothesis (H0): $u \geq 13.9$ and Alternative Hypothesis (H1): $u<13.9$.

Step 2 ：If we fail to reject the null hypothesis when we should have rejected it, this is a type of error.

Step 3 ：The type of error that occurs in this case is a $\boxed{\text{Type II error}}$.