T tests

Question 1

Assumptions of T test

Answer 1

• the values in samples must be independent ( participants cant influence each others answers
• The population sampled must be normal
• For independent only ( between groups ( differenent groups - assumes homogenity of variance

Question 2

What is homogeneity of variance

Answer 2

The two populations from which the samples are selected must have equal variances. SPSS uses Levenes Test to test.
If result is not sig than assumption is met
If is significant then the assumption is violated.