A common mistake many statistics students make is saying we "accept the null" or " prove the null" instead of "fail to reject the null".
Question: Explain why "failing to reject the null" is not the same as "accepting the null". Support the statement that your claim should be worded so that what you want tested will be in the alternative hypothesis.
https://liesandstats.wordpress.com/2008/10/25/you-cant-prove-the-null-by-not-rejecting-it/.
"You Can't Prove the Null by Not Rejecting It"