Coming soon
Statistics calculators that show their work.
Free calculators for intro college statistics. Every answer comes with a plain-English interpretation, the steps behind it, and the matching TI-84 command.
What's on the way
Describing data
1-Var Stats, frequency tables and histograms, five-number summary and boxplots, z-scores and percentiles
Probability
Counting (nPr, nCr), discrete distributions, binomial probabilities
Normal distribution
Shaded-area normalcdf and invNorm, plus sampling distributions and the Central Limit Theorem
Confidence intervals
Means and proportions (Z, T, 1-Prop), plus sample size for a margin of error
Hypothesis tests
Z-Test, T-Test, and 1-PropZTest, with p-value and critical-value methods
Regression
Scatterplots, correlation, and the least-squares line with predictions