How to tell if a hypothesis test is left or right tailed
Step 1. Set up hypotheses and select the level of significance α. H 0: Null hypothesis (no change, no difference); H 1: Research hypothesis (investigator's belief); α =0.05.
Step 1. Set up hypotheses and select the level of significance α. H 0: Null hypothesis (no change, no difference); H 1: Research hypothesis (investigator's belief); α =0.05.
For a left tailed test we need to check if the test statistic (TS) is smaller than the critical value (CV). If the test statistic is smaller the critical value, the test statistic is in the rejection region.
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