Author Archive | Jessica Knoch

• Jessica is a math instructor at Lane Community College, with degrees in mathematics and systems engineering from the University of Cincinnati and the University of Virginia. Her academic interests include math and math education, and boosting students' confidence with tough subjects. Outside of teaching, she enjoys watching football, finding real-world questions that can be answered with statistics, and spending time with family.

Probability OR Explained

In probability, two events can be linked with an OR. In this post we’ll explore the probability OR, and explain how to calculate it. When we’re talking about probability, OR has a very specific meaning, and it’s not always the same as the regular English meaning.

How are Quartiles Used in Statistics?

Quartiles are numbers that divide a data set into four-equal sized groups. Find out the uses of quartiles, how to find them, and why they are more useful than any single measure of center or spread!

How to Make a Box and Whisker Plot

If you’d like to know how to make a box and whisker plot, you’re in the right place. A box and whisker plot is a great way to get a visual look at the five number summary. Learn how to make one with step-by-step instructions.

Type I Error Definition and Examples

Sometimes the conclusion you draw from a hypothesis test is incorrect. In this article, we’ll look at one way it can be incorrect, called a Type I error.

Type II Error Definition and Examples

Type II errors are the “false negatives” of hypothesis testing. Learn more about what Type II errors are, why they happen, and how to avoid them!

A Crash Course on Mean, Median, and Mode

You’ve heard of mean, median, and mode, and you want to know what the deal is. What’s the difference? What are they for, and how do you find them?