Null Hypothesis (Ho):
The hypothesis to be tested and that you want to disprove it. It is initially regarded as true until gathering enough proof to either reject the null hypothesis, or fail to reject the null hypothesis. To support or reject the hypothesis but NOT to accept it.
Alternative Hypothesis (Ha):
A statement to be accepted if the null hypothesis is rejected.
Two-tailed tests:
Ho: Mean = X
One-tailed tests:
Ho: Mean ≤X, or Ho: Mean ≥ X
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