Statisticals Tutorials

A three-way ANOVA is used to determine how three different factors affect some response variable. Three-way ANOVAs are less common than a…

A one sample z-test is used to test whether the mean of a population is less than, greater than, or equal to some…

A two sample z-test is used to test whether two population means are equal. This test assumes that the standard deviation of each…

We can use the following formula to calculate the upper and lower bounds of a confidence interval for a population median: j:…

The exponential distribution is a probability distribution that is used to model the time we must wait until a certain event occurs.…

The uniform distribution is a probability distribution in which every value between an interval from a to b is equally likely to…

One of the key assumptions of linear regression is that the residuals are distributed with equal variance at each level of the…

Often in statistics we’re interested in collecting data so that we can answer some research question. For example, we might want to…

When we want to understand the relationship between a single predictor variable and a response variable, we often use simple linear regression.…

A Kruskal-Wallis test is used to determine whether or not there is a statistically significant difference between the medians of three or more…