Health Sciences 2801A/B Lecture Notes - Lecture 11: Null Hypothesis, Type I And Type Ii Errors, Central Limit Theorem

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 2801A/B
• Professor: Christopher Lee

Document Summary

We always compare our best guess against the assumption that nothing happened . Null hypothesis: nothing has happened, no relationship exists, no change has occurred. Rejecting the null hypothesis likely to be correct. Since you are always testing your research hypothesis against the null hypothesis, your proposed effect is demonstrated when the null hypothesis is rejected . If you reject the null hypothesis, you may conclude that the alternate hypothesis is. Change must occur in the correct direction as compared to the mean. In a directional hypothesis, there is a specific result that one wants to test. When we are interested in a score increase then it is called an upper-tail test. When we are interested in a score decrease then it is called a lower-tail test. In a non-directional hypothesis, one is comparing change that might occur in either tail of the. Now two critical values, and therefore two rejection areas for the null hypothesis.