Research library.
Choose a concept. Read the definition, explore an example and test your understanding.
14 concepts
Statistics3 min read
Correlation
Changing together does not mean causing each other.
Beginner
Statistics4 min read
Confidence interval
Show uncertainty, not just a single number.
Intermediate
Statistics3 min read
Margin of error
Sampling uncertainty around an estimate.
Intermediate
Statistics2 min read
Standard deviation
Summarize spread around the mean.
Beginner
Statistics2 min read
Outlier
An observation far from the overall pattern.
Beginner
Statistics2 min read
p-value
Assess incompatibility with a null hypothesis.
Intermediate
Statistics2 min read
Type I error
Reject a null hypothesis that is actually true.
Intermediate
Statistics3 min read
Effect size
Express how large a difference or relationship is.
Intermediate
Statistics3 min read
Statistical power
The probability of detecting a specified real effect.
Advanced
Statistics3 min read
Multiple testing
Consider false alarms across a set of tests.
Advanced
Statistics3 min read
Bonferroni correction
A simple way to limit false positives across a test family.
Advanced
Statistics3 min read
Type II error
Fail to reject a null hypothesis that is false.
Intermediate