1. Chapter 14 Conducting & Reading Research Baumgartner et al Chapter 14 Inferential Data Analysis

2. Chapter 14 Conducting & Reading Research Baumgartner et al Two Independent Groups t Test Draw two samples from same population and administer different tests Draw a sample from each of two populations

3. Chapter 14 Conducting & Reading Research Baumgartner et al Is there a sex difference for alcohol intake in C57 strain of mice? Step 1: define hypotheses

4. Chapter 14 Conducting & Reading Research Baumgartner et al Is there a sex difference for alcohol intake in C57 strain of mice? Step 2: define alpha level

5. Chapter 14 Conducting & Reading Research Baumgartner et al Is there a sex difference for alcohol intake in C57 strain of mice? Step 3: Determine critical value Step 4: Conduct statistical test

6. Chapter 14 Conducting & Reading Research Baumgartner et al Is there a sex difference for alcohol intake in C57 strain of mice? Step 5: Accept or reject null hypothesis

7. Chapter 14 Conducting & Reading Research Baumgartner et al Two dependent Groups t Test Repeated measures design: Matched pairs design:

8. Chapter 14 Conducting & Reading Research Baumgartner et al Decision on Alternate Hypotheses and Alpha Level Remember to consider whether the test is one- or two-tailed Decision/ H 0 AcceptReject TrueGood decision FalseGood decision

9. Chapter 14 Conducting & Reading Research Baumgartner et al Decision on Alternate Hypotheses and Alpha Level Remember to consider whether the test is one- or two-tailed Decision/ H 0 AcceptReject TrueGood decisionType I error (False positive) FalseGood decision

10. Chapter 14 Conducting & Reading Research Baumgartner et al Decision on Alternate Hypotheses and Alpha Level Remember to consider whether the test is one- or two-tailed Decision/ H 0 AcceptReject TrueGood decisionType I error (False positive) FalseType II error (False negative) Good decision