Instructional Video6:40
Curated Video

An Introduction to Statistical Hypothesis Testing

Higher Ed
The video is a lecture presentation on statistical hypothesis testing. The presenter introduces the concept of hypothesis testing and explains why it is necessary in scientific research. They define key terms such as null hypothesis,...
Instructional Video3:56
Curated OER

What Does It Mean When an Inequality is a Contradiction or Has No Solution?

8th - 11th
If you plug in a value for a variable in an inequality and you get a contradiction then the inequality has no solution. Is that really possible? Yes, it is. Watch this video and see the several examples that the instructor will present...
Instructional Video
Virtual Nerd

Virtual Nerd: What Does It Mean When an Equation Has No Solution?

9th - 10th
Watch this video tutorial and learn what it takes for an equation to have no solution. [3:46]
Instructional Video
Khan Academy

Khan Academy: Worked Examples: Geometry: Ca Geometry: Proof by Contradiction

9th - 10th Standards
Students explore how to do a geometric proof by contradiction.