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https://www.khanacademy.org/math/ap-statistics
When to use z or t statistics in significance tests
Introduction to Type I and Type II errors
Differences of sample proportions
Sampling distribution of a sample mean
Sampling distribution of a sample proportion
Dispersion (or Variability)
Kurtosis γ₂
Platykurtic / Mesokurtic / Leptokurtic
Skewness
Positive / Zero / Negative
Quartiles
Interquartile range (IQR)
Range
Standard Deviation σ
Population and sample standard deviation review
Standard deviation in a normal distribution
Variance σ²
The Absolute Deviation from Mean, also called Mean Absolute Deviation (MAD)
Central Tendency
Mean (Average) μ
Median (50th percentile)
Mode
Unimodal / Bimodal / Multimodal