Tutorials

A two-way ANOVA (“analysis of variance”) is used to determine whether or not there is a…

The central limit theorem states that the sampling distribution of a sample mean is approximately normal if…

The normal distribution is the most common probability distribution in statistics. Normal distributions have the following features:…

Researchers are often interested in answering questions about populations like: What is the average height…

Imagine there exists a population of 10,000 dolphins and the mean weight of a dolphin…

A Mann-Whitney U test (sometimes called the Wilcoxon rank-sum test) is used to compare the…

Suppose we have the following dataset that shows the square feet and price of 12…

Scatterplots are used to display the relationship between two variables. Suppose we have the following dataset…

A paired samples t-test is used to compare the means of two samples when each…

Simple linear regression is a statistical method you can use to understand the relationship between…