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Statisticals Tutorials

• Three-Way ANOVA: Definition & Example

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

• Two Sample Z-Test: Definition, Formula, and Example

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

• One Sample Z-Test: Definition, Formula, and Example

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

• How to Find a Confidence Interval for a Median (Step-by-Step)

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

• An Introduction to the Exponential Distribution

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

• An Introduction to the Uniform Distribution

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

• The Breusch-Pagan Test: Definition & Example

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

• Statisticals Tutorials

Population vs. Sample: Whatâ€™s the Difference?

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

• Introduction to Multiple Linear Regression

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

• Dunnâ€™s Test for Multiple Comparisons

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