He failed to reject the Null Hypothesis when he should have. That is called a false negative. The decision to reject or not ...

Interpret the results and either reject the null hypothesis ... formulation may lead to incorrect conclusions or failed tests. Hypothesis testing can also lead to errors, such as analysts either ...

If the P value is less than 5%, reject the null hypothesis; if the P value is .05 or more, don't reject the null hypothesis. Statistics textbooks -- and statisticians for that matter -- focus ...