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

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

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

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

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

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

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

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

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

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