STAT 263 Lecture 19: Chapter 12 Lecture Notes - Week 7
23 Jun 2017
School
Department
Course
Professor
Document Summary
Null hypothesis h0: what we assume to be true before we do analysis, set up primarily to see whether it can be rejected. The hypothesis of no difference, no change, no relationship . Alternative hypothesis ha (research hypothesis / h1): formulated together with the null hypothesis and is accepted if the null hypothesis is rejected. A two-tail test is testing whether something is changing (can improve or deprove) We want to test the hypothesis that the mean reaction time to a visual stimulus is 0. 38 seconds against the alternative hypothesis that the reaction time is not 0. 38 seconds. Ans: two-tail because the alternative is that the mean can be higher or lower. Type 1 error (false negative): if the null hypothesis mean is correctly centered on (population mean), but falls in one of the rejection regions by chance and therefor the null hypothesis will be rejected in error!
