Statistics problems
Mean, variance, covariance, distributions. What the data tells you.
420 problems155 Easy185 Medium80 Hard
50 problems
Mean
st-001
Variance
st-002
Covariance
st-003
Pearson Correlation
st-004
Normal Distribution PDF
st-005
Median
st-006
Mode
st-007
Geometric Mean
st-008
Harmonic Mean
st-009
Weighted Mean
st-010
Range
st-011
Cumulative Sum
st-012
Difference Series
st-013
Histogram Bin Counts
st-014
Empirical CDF at Point
st-015
Median Absolute Deviation
st-016
Interquartile Range
st-017
Z-Score
st-018
Standard Error of the Mean
st-019
Coefficient of Variation
st-020
F1 Score from Counts
st-021
Trimmed Mean
st-022
Quartiles (Tukey Hinges)
st-023
Percentile (Linear Interpolation)
st-024
Population Skewness
st-025
Population Excess Kurtosis
st-026
Third Central Moment
st-027
Correlation Matrix 2x2
st-028
Rolling Mean
st-029
Rolling Population Standard Deviation
st-030
Exponentially Weighted Mean
st-031
Autocorrelation Lag-1
st-032
Robust Z-Score via MAD
st-033
Winsorize List
st-034
Outlier Count by 3-Sigma
st-035
Outlier Count by IQR Fence
st-036
One-Sample t-Statistic
st-037
Pooled Variance
st-038
Chi-Square Statistic for Counts
st-039
Odds Ratio and Risk Ratio 2x2
st-040
Sensitivity and Specificity from Counts
st-041
Spearman Rank Correlation with Ties
st-042
Covariance Stationary Check Lite
st-043
Welch t-Statistic
st-044
Welch Degrees of Freedom
st-045
G-Test Statistic
st-046
Permutation p-Value from Difference of Means
st-047
Bootstrap Mean CI (Percentile)
st-048
Mann-Whitney U and Wilcoxon Rank-Sum
st-049
Cramer's V from Chi-Square
st-050
Showing 50 of 420 problems.