1. Construct a confidence interval and state a conclusion (Reject H_o, Fail to Reject H_o) for the following examples.

a.Est std err = 3.5Sample 1: M = 163n = 124Sample 2: M = 150n = 178

Construct a 95% confidence interval with a two-tailed hypothesis

b.Est std err = 0.11Sample 1: M = 3.2n = 24Sample 2: M = 3.4n = 15

Construct a 99% confidence interval with a two-tailed hypothesis

2.We have two samples, one with 8 participants and another with 12. Using a one- tailed test, with an alpha of .05, what t-critical value(s) will we use?

3.What is our t-critical value(s) if our samples have 12 and 19 people, we want to use an alpha of .01, and do not have hypotheses which include direction?