There are two types of errors:

• Type I Error: In this type of error, we reject H0 when, in fact, H0 is true. An example of this would be a jury convicting an innocent person for a crime that the person did not commit.
• Type II Error: In this type of error, we fail to reject H0 when, in fact, H1 is true. This is equivalent to a guilty person escaping conviction.

Here's a table showing null hypothesis conditions leading to an error: