Beginner Statistics
Chi-Square Tests
Fisher’s Exact Test: Definition, Formula, and Example
Fisher’s Exact Test is used to determine whether or not there is a significant association between two categorical variables. It is typically used as an alternative to...
Random Variables
An Introduction to the Multinomial Distribution
The multinomial distribution describes the probability of obtaining a specific number of counts for k different outcomes, when each outcome has a fixed probability...
Confidence Intervals
Confidence Interval for the Difference in Proportions
A confidence interval (C.I.) for a difference in proportions is a range of values that is likely to contain the true difference between two population proportions...
Hypothesis Testing
Two Proportion Z-Test: Definition, Formula, and Example
A two proportion z-test is used to test for a difference between two population proportions.
This tutorial explains the following:
The motivation for performing a two proportion z-test.
The...
Hypothesis Testing
One Proportion Z-Test: Definition, Formula, and Example
A one proportion z-test is used to compare an observed proportion to a theoretical one.
This tutorial explains the following:
The motivation for performing a one proportion z-test.
The...
Hypothesis Testing
Two Sample t-test: Definition, Formula, and Example
A two sample t-test is used to determine whether or not two population means are equal.
This tutorial explains the following:
The motivation for performing a...
Hypothesis Testing
One Sample t-test: Definition, Formula, and Example
A one sample t-test is used to test whether or not the mean of a population is equal to some value.
This tutorial explains the following:
The motivation...
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