Hypothesis Testing

Control Group Post-Test Only Design

Control Group Post-Test Only Design

Control Group Post-Test Only Design

Control Group Post-Test Only Design

Demonstration

Demonstration Control Group Post-Test Only Design

Demonstration Control Group Post-Test Only Design

Demonstration Control Group Post-Test Only Design

Demonstration Control Group Post-Test Only Design

Experimental Hypotheses

Null Hypothesis

Schooler, Et Al. Null Hypothesis

Alternate Hypothesis

Schooler, Et. Al.  Alternate Hypothesis

Comparing two means

Comparing two means

Comparing two means

Comparing two means

Comparing two means

Comparing two means

Statistical Inference

Experimental Errors

Decisions about Ho

Statistical Decision and Reality

Statistical Decision and Reality

Statistical Decision and Reality

Statistical Decision and Reality

Statistical Decision and Reality

Hypothesis Testing

The Normal Distribution for Sample Means

H0: X1 =  X2

H1: X 1 =  X2

H1: X 1 =  X2

Statistical Inference

Statistical Decision

 Independent T-Test Formula

Assumptions for t-test

When to use Independent t-test

How to use a t-test

1. Write the formula

2.  Find the parts

3.  Calculate each part

4.  Substitute parts into formula

5.  Calculate formula

6.  Evaluate Outcome

One-tailed test

Two-tailed test

Using the critical t method

Using the critical t method

Using the significance level method

Types of Errors

Type One Error

Type Two Error

Statistical Decision Making

Statistical Decision and Reality

Statistical Decision and Reality

Statistical Decision and Reality

Statistical Decision and Reality

Statistical Decision and Reality