Table of Contents
Minimizing Chance of Type I and Type II Errors
O.J. Simpson trial: the situation
O.J. Simpson trial: jury decisions
Errors in Trials
Errors in Hypothesis Testing
Definitions: Types of Errors
Example: Grade inflation?
If X-bar is 2.865 …
If X-bar is 2.95 …
If X-bar is 3.00 …
Alternative Decision Rule
Type I Error
Minimize chance of Type I error...
P(Type I Error) in trials
Example: Serious Type I Error
Example: Not so serious Type I Error
Type II Error and Power
Type II Error and Power
Type II Error and Power
Power
Using Minitab to determine power
Maximizing power …
That is, factors affecting power...
Strategy for designing a good hypothesis test
Using Minitab to determine sample size
If sample is too small ...
If sample is really large ...
The moral of the story as researcher
The moral of the story as reviewer |
