PSYC 3000 Lecture Notes - Lecture 58: Multiple Comparisons Problem, Family-Wise Error Rate, Analysis Of Variance

• School: Carleton University
• Department: Psychology
• Course: PSYC 3000
• Professor: Bruce Hutcheon

Document Summary

Questions about multiple comparisons: whenever you have to conduct more than one t-test as part of a multiple comparisons procedure, the fw type i error rate will be larger than the pc error rate. a) true b) false. Explanation each time you conduct a test in a multiple comparisons procedure you expose yourself to the possibility of committing a type i error. If you undertake 2 tests then you have exposed yourself to this possibility twice. The overall probability of committing a type i error therefore has top be larger than for just a single test. Each time you undertake a new test in the family you once again expose yourself to the possibility of committing a type i error and these possibilities add together. The overall type i error rate over the entire family of tests is therefore larger than in any single tests.