Hypothesis testing - One sided tests

5 important questions on Hypothesis testing - One sided tests

What does the HA of a one-sided test entail?

The HA includes parameter values on only one side of the value specified by the null hypothesis.

When is H0 rejected in a one-sided test?

If the data depart from H0 in one direction, stated by HA

Why should the HA of a one-sided test be chosen before looking at the data?

Data will always be on one side or the other of the H0, so the data themselves cannot be used to predict which diretion the deviation might be
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Why is calculating a P-value for a one-sided test different from the P-value for a two-sided test?

Because the only outcomes that would cause us to reject H0, are those stated by HA and thus by an unusually large number of correct guesses. Therefore only one tail of the null distribution is examined.

Why is using a two-sided test recommended?

The arguments of using a one-sided test can vary between researchers.

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