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Beginner Statistics

The Normal Distribution

The normal distribution is the most common probability distribution in statistics. Normal distributions have the following features: Bell shape Symmetrical Mean and median are equal; both are located at the...

Mann-Whitney U Test

A Mann-Whitney U test (sometimes called the Wilcoxon rank-sum test) is used to compare the differences between two independent samples when the sample distributions...

Paired Samples t-test: Definition, Formula, and Example

A paired samples t-test is used to compare the means of two samples when each observation in one sample can be paired with an...

Introduction to Hypothesis Testing

A statistical hypothesis is an assumption about a population parameter. For example, we may assume that the mean height of a male in the U.S....

Introduction to Simple Linear Regression

Simple linear regression is a statistical method you can use to understand the relationship between two variables, x and y. One variable, x, is known...

Introduction to Hypothesis Testing

A statistical hypothesis is an assumption about a population parameter. For example, we may assume that the mean height of a male in the U.S....

What is a Sampling Distribution?

Imagine there exists a population of 10,000 dolphins and the mean weight of a dolphin in this population is 300 pounds. If we take a...

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