1. State the critical values for a one-sample t test given the following conditions: a. Two-tailed test, = .05, n = 12

b. One-tailed test, lower-tail critical, = .01, df = 15

c. Two-tailed test, = .01, df = 26

d. One-tailed test, upper-tail critical, = .05,n = 30

2. State the total degrees of freedom for the following t tests:

a. n = 12 for a one-sample t test

b. Critical value = 1.645 for a one-tailed test, = .05

3. A social psychologist records the number of outbursts in a sample of different classrooms at a local school. Based on the statement below, what are the sample size, decision (retain or reject the null hypothesis), and effect size in this study?

The number of outbursts among students at this local school (M = 3) was significantly less than that in the general population, t(39) = 4.19, p < .05 (d = 0.25).