9.33 Identify the critical t values for each of the following tests:

a. Researchers wanted to know if marriage counseling improved participants’ marital satisfaction. Scores were collected on the Marital Satisfaction Inventory for 15 people after a 12-week marriage counseling program. Using an alpha level of 0.01, identify the critical t value(s) for this one-tailed, single-sample t test.

b. A sample of fourth graders (N = 44) participated in a new curriculum for multiplication. A single-sample t test (using an alpha level of 0.05) was conducted to see if there was a significant difference between the scores of the students who participated in the new curriculum compared to the scores of all the students attending the same school. Identify the critical t value(s) for this two-tailed, singlesample t test.