Hypothesis Testing and P-values Eco 5375 Economic and Business Forecasting Fall 2014.

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Hypothesis Testing and P-values Eco 5375 Economic and Business Forecasting Fall 2014

Comparison of Two Populations: Example of Hypothesis Testing Source of this and next three slides: The T-Test assesses whether the means of two groups are statistically different from each other. This analysis is appropriate whenever you want to compare the means of two groups, and especially appropriate as the analysis for the posttest-only two-group randomized experimental design.posttest-only two-group randomized experimental design

The Notion of Statistical Distance Be Careful!

Difference in Group Means Adjusted for Variability of Groups

Ingredients of T-statistic

Reference Distributions for Hypothesis Testing

An Example

One-tail P-value: For One-sided Null Hypotheses

Two-tail P-value: For Two-sided Null Hypotheses

Calculator for P-Values