It is advantageous to use analysis of variance rather than the t ratio when more than two groups are involved because:

Question

A) analysis of variance is easier to calculate

B) multiple t-tests increase the risk of a type l error

C) both A and B

D) none of the above

Answer 1

T-tests are used to compare up to 2 groups (can also be used for one). If you had more than 2 groups, you will have to do multiple 2-group comparisons/tests, for all the possible pairs, and since a type 1 error is associated with each comparison, multiple comparisons will result in greater risk of type 1 error.

 

answer: B

Answer 2

Answer (C)