Rejecting or Failing to reject the Null Hypothesis (Ho) depends of the P-Value. Generally, the P-value (probability( Observation | Ho ) ) is around .05, thus minimizing the Type 1 error rate. If the P-value < Alpha , you would reject the Ho, and instead believe the Ha (Alternative Hypothesis), and if the P-value > Alpha, you would Fail to reject the Ho because there is not enough evidence to believe the Ha.
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The answer depends on how the test has been set out and, at this level of detail, it is essentially up to the user.
The word 'reject' is both a verb and a noun.The noun 'reject' is a concrete or abstract noun depending on context.The noun 'reject' is a concrete noun as a word for a person or a physical thing dismissed or rejected.The noun 'reject' is an abstract noun as a word for an idea or a concept dismissed or discarded.The abstract noun forms of the verb to reject are rejection and the gerund, rejecting (words for a process).
reject?
The null hypothesis will not reject - it is a hypothesis and is not capable of rejecting anything. The critical region consists of the values of the test statistic where YOU will reject the null hypothesis in favour of the expressed alternative hypothesis.
Reject.