PSY 555 Homework 11

Chapter 7: #6,8,9,10,13,14,16,25 (for each problem involving t-tests,
please list what type of test is appropriate to be used).

1. Please
describe the difference between within subjects and between subjects
t-tests. List the different types of
each category of t-tests.

2. Why
do we need to test for homogeneity of variance when conducting a t-test?