This interactive site explores how sample size, effect size, false positive, and false negative rates are related.
Type of Material:
Animation, Shiny application
Recommended Uses:
This can be used during lecture to present the covered relationships, as an in-class exploration, or for at home learning.
This material has limited use as a stand alone but will make a great supplemental material for existing lecture / homework / assignment / activity on the topic.
Technical Requirements:
The application needs a browser to render. The user would need to be connected to the internet to access the website. In particular, it needs a JavaScript enabled browser.
Identify Major Learning Goals:
This application provides hands-on learning to students on understanding the relationship between effect size, sample size, and power of a statistical test.
Target Student Population:
Statistics students for High School, College Lower Division, College Upper Division, Graduate School
Prerequisite Knowledge or Skills:
Knowledge of hypothesis testing
Content Quality
Rating:
Strengths:
This site is a helpful visualization of the connection between the sample size, the power, and the level of significance. It provides a simple explanation of what the power and the significance level are, and the graph shows the relationship between these and the sample size. It is great for an in-class demonstration or a group activity.
Concerns:
It would be helpful to provide a link to a more thorough explanation of the statistical terms that are used. It is unclear about the underlying distribution.
Potential Effectiveness as a Teaching Tool
Rating:
Strengths:
This provides the student with much more than just a definition of the power and level of significance. The interactivity will help students understand these important statistics concepts. The material can be used in class for demonstrating the concept by the instructor.
Concerns:
Without getting an explanation of what the baseline conversion rate is, that slider will be confusing to the student. It can not be used as a standalone application. It has to be incorporated in the class with other material.
Ease of Use for Both Students and Faculty
Rating:
Strengths:
The sliders are very intuitive to use, and the graphs are clearly presented.
Concerns:
On the bottom is a table based on the relative percent change and the sample size. The values of this table are not visible when the screen is small and when the screen is large, only one row is visible at a time. It can not be used as a standalone application.
Creative Commons:
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