Identify critical t v alues for each of the following tests:

a. A one-tailed, paired-samples t test performed on before-and-after scores on the Marital Satisfaction Inventory for 18 people who went through marriage counseling, using a p level of 0.01.

b. A two-tailed, paired-samples t test performed on before-and-after scores on the Marital Satisfaction Inventory for 64 people who went through marriage counseling, using a p level of 0.05.