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Suppose that you regard a court trial as a hypothesis test with null and alternative hypotheses .

When the defendant is infect, it is assumed that he or she is guilty.

This is a type - I mistake.

When the defendant infects, it is determined that he or she is not guilty.

This is the Il error type.

The type-I error probability $伪$would be very low for a defendant, because non-rejection of the true null hypothesis is critical to him. Naturally, he will want to reduce the chances of true$H_0$being rejected.

The prosecution attorney would like the type - Il error ,$尾$to be modest since rejecting the incorrect null hypothesis is crucial to him. Naturally, he will endeavor to reduce the likelihood of mistaken rejection$H_0$.

$$\begin{gathered} 伪=0 \\ \text{i.e.,}P(\text{Type}鈭�\text{I error})=0 \end{gathered}$$

It means that an innocent person is never found guilty because true is never rejected.$H_0$.

localid="1651572469422" $$\begin{gathered} 尾=0 \\ \text{i.e.,}P\text{(Type}鈭�\text{II error})=0 \end{gathered}$$

It indicates that a guilty person is always found guilty since there is no possibility for false evidence to be rejected.localid="1651572456302" $H_0$.