zshade
ZShade
Turn z-scores into probabilities and see the area under the standard normal curve.
THE TOOLLINKS COLLECTION
Math & data tools & calculators
Explore 20 tools for math & data, with direct links to individual calculators and learning tools.
Choose the task you need. Each link opens the specific tool; check its methods and limitations before relying on a result.
statisticsdock
Data Summary & Cleaning
Profile CSV columns, flag issues, and create a cleaned in-memory dataset.
statisticsdock
Visualization Studio
Build histograms, boxplots, and scatterplots with text summaries.
statisticsdock
Test Picker
Use a guided decision tree to choose the next statistical method.
statisticsdock
Confidence Intervals
Build intervals for means, proportions, and common differences.
statisticsdock
t-Test Suite
Run one-sample, Welch two-sample, and paired t-tests locally.
statisticsdock
Chi-Square Suite
Analyze categorical counts with goodness-of-fit or independence tests.
statisticsdock
One-Way ANOVA
Compare three or more group means and review group summaries.
statisticsdock
Correlation Explorer
Measure Pearson or Spearman association and inspect the scatterplot.
statisticsdock
Simple Linear Regression
Fit a simple line, inspect residuals, and export a report-ready summary.
statisticsdock
Distribution & P-Value Explorer
Explore normal, t, chi-square, and F probabilities and critical values.
matrix-calculator
Determinant Calculator
Calculate determinants using elimination with exact fractions and readable row-operation steps.
matrix-calculator
Linear System Solver
Solve Ax = b with exact fractions and detect unique, inconsistent, or infinite-solution systems.
matrix-calculator
Matrix Addition Calculator
Add matrices with exact fractions and clear dimension checks for valid entrywise addition.
matrix-calculator
Exact Fraction Matrix Calculator
Work with matrices using exact fractions, row reduction steps, and common linear algebra operations in one place.
matrix-calculator
Matrix Inverse Calculator
Find the inverse of a square matrix using exact fractions and step-by-step Gauss-Jordan elimination.
matrix-calculator
Matrix Multiplication Calculator
Multiply matrices using exact fractions and dimension checks that explain invalid products clearly.
matrix-calculator
Rank Calculator
Find matrix rank from exact row reduction and review the pivots that determine it.
matrix-calculator
RREF Calculator
Calculate row-reduced echelon form using exact fractions and step-by-step Gauss-Jordan elimination.
matrix-calculator
Transpose Calculator
Transpose matrices exactly, switching rows and columns without losing fractional precision.