Beginner Statistics
Random Variables
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...
Hypothesis Testing
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...
Hypothesis Testing
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...
Hypothesis Testing
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....
Regression
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...
Hypothesis Testing
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....
Sampling Distributions
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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