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...
Statology
Chi-Square Goodness of Fit Test: Definition, Formula, and Example
A Chi-Square goodness of fit test is used to determine whether or not a categorical variable follows a hypothesized distribution.
This tutorial explains the following:
The motivation...
Statology
Here is How to Interpret a P-Value of 0.000
When you run a statistical test, whether it’s a chi-square test, a test for a population mean, a test for a population proportion, a...
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....
Statology
What are Confidence Intervals?
Often in statistics we’re interested in measuring population parameters – numbers that describe some characteristic of an entire population.
Two of the most common population parameters...
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...
Statology
What Are Random Variables?
A random variable, typically denoted as X, is a variable whose possible values are outcomes of a random process.
There are two types of random...
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