Week 11

Two-Sample Hypothesis Testing

Potential Causes of Group Differences

Terminology

Treatment Verses Control Groups

Independent Verses Nonindependent Groups

Matching

How it is done

Sampling Distribution of the Difference Between Means

Characteristics

Properties

Standard Error of the Difference Between Means

Miscellaneous Issues

Sample Size

Random Assignment

Is dependent approach better?

T-Tests

Why They Were Developed

Characteristics of t - distribution

Know How Degrees of Freedom Relate to Sample Size

Know How to Use t - distribution

Directional and Nondirectional tests

Alpha Equal to .05 and .01

Applications of t - distribution

Testing Hypotheses About a Single Mean

Hypothesis Testing with Two Groups

Independent

Dependent