AP Statistics Distribution Calculator
Calculate normal distribution probabilities with an interactive bell curve. Includes t-distribution and chi-square critical value tables for hypothesis testing.
Common questions
Enter a mean, standard deviation, and x-value to calculate normal distribution probabilities. The interactive bell curve shows the shaded area representing your probability. You can calculate P(X < x), P(X > x), or P(a < X < b).
These are lookup tables for critical values used in hypothesis testing. The t-table is used for t-tests and confidence intervals with small samples. The chi-square table is used for goodness-of-fit and independence tests.
The calculator does this automatically. Enter your mean and standard deviation along with your x-value, and it will display the corresponding z-score. The formula is z = (x - μ) / σ.
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