Confidence Intervals
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: nq – z√nq(1-q)
k:...
Random Variables
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.
This distribution can...
Random Variables
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 occur.
If a...
Regression
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 predictor variable....
Tutorials
Population vs. Sample: What’s the Difference?
Often in statistics we’re interested in collecting data so that we can answer some research question.
For example, we might want to answer the following...
Regression
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.
However, if we’d...
ANOVA
Dunn’s Test for Multiple Comparisons
A Kruskal-Wallis test is used to determine whether or not there is a statistically significant difference between the medians of three or more independent groups....
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