Types of Tests

1. Two- tailed test - When the alternate hypothesis contains the "not equal to" symbol.
2. Right - tailed test - When the alternate hypothesis contains the " greater than " symbol
3. Left - tailed test - When the alternate hypothesis contains the " less than" symbol

A one tailed test indicates that the null hypothesis should be rejected when the test value is on the critical region on one side of the mean. A one-tailed test is either right - tailed or left - tailed, depending on the direction of the inequality hypothesis. In a two - tailed test, the null hypothesis should be rejected when the test value is either of the two critical values.


Summary:
Two tailed tests
(H0) µ = k
(H1) µ ≠  k


Right - tailed tests
(H0) µ ≤ k
(H1) µ > k


Left - tailed tests
(H0) µ ≥ k
(H1) µ < k




D. Bertiz