The TI89 app "Statistics Made Easy" solves Statistics and Probability problems stepwise. It is available at www.ti89.com .
Step by Step Confidence Intervals for mean, proportion, 2 means, 2 proportions, variance, slope, etc.
Compute Sample Sizes for Confidence Intervals.
Step by Step Tests of Significance (Z-Tests, T-Tests, ChiSquare Goodness of Fit and Independence tests, 2-sample T tests, 2 proportion Z tests, for Variance, etc)
Step by Step Non-Parametric Tests: Wilcoxon Sign Test, Rank Sum Test, Signed Rank Test, Kruskal Wallis Test, Friedman Test, etc.
Step by Step F Test for 2 variances
Step by Step ANOVA to test multiple means.
Step by Step 2-way ANOVA.
Step by Step Linear Regression.
Read about how Confidence Intervals behave.
Read about how Significant Tests: Type 1 Error, Type 2 Error, Power of a Test.
Much easier handling than other Statistics packages: Choose to enter Data or Statistic values. Select Significant/Confidence Levels easily.
Distributions: plot them, shade them where desired, compute probabilities, etc.
Includes Binomial, Negative Binomial, Geometric, Normal, Student-t, Exponential, Poisson, Uniform, Sampling, Multinomial, Hypergeometric, F-, Chi-Square and more Distributions.
Probability Checker for independent events, disjoint events. Also solves P(A or B)=P(A)+P(B)-P(A and B) for the unknown.
Regressions: Linear , Quadratic, Cubic, Quartic, Sinusoidal, Logarithmic, Exponential, Power, MedMed
Study Residuals and plot them
Step by Step Derive the Coefficients for a Linear Regression Line, the Coefficient of Determination and the Correlation Coefficient.
Read Theorems such as Central Limit Theorem, Random Variables, about Confidence Intervals and Tests, etc
Also: Z-score Solver, Random Number Generator, etc
1 or 2 variable stats on mean, mode, median, standard deviation, variance, range, harmonic and geometric mean
Plots: BoxPlots, x-y Plots, Scatter Plots, Histograms, Modified Box Plot
View a simulation of the Law of Large Numbers, Read about Simpson Paradox.
Compute Marginal and Conditional Probabilities.
Read About Surveys, Samples, Population, Parameter, Statistics, Observational Studies vs Experiments.
Random Variables: Compute Variance, Expected Value and Standard Deviation.
Additional Modules on: Probability, Combinatorics, Percentages, Ratios, Proportions, Exponential and Logarithmic Functions, Exponential Function Solver, Expand and Condense Logarithms, Algebra, Equation Solver
Multiple Regression Analysis Step by Step incl. Statistical Tests (optional table displays as in other software packages) , Confidence Intervals and Prediction Intervals.
ANOVA and 2way ANOVA - Step by Step
Control Charts
Step by Step Power-, Beta- , Type 2 Error Analysis for Z Tests for Means and Proportions.
Non-Parametric Tests for 1 sample: Sign Test, Rank Sum Test
Friedman Test
Normal Probability Plot with Quantiles
Weibull, Gamma and Beta Distributions.
Joint, Marginal and Conditional Probabilities for both Continuous and Discrete distributions.
Find cdf given pdf and vice versa.
Margin of Error computation
NormInv() , Tinv() to find critical values given p-values.
Ideal for quick review and homework check.
Easy to use. Just plug in and the correct answer shows.
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