| Topic | Link to app | Description |
|---|---|---|
| Trigonometry | Unit Circle | Geometric interpretation of the sine and cosine functions using a cirlce with radius of one. |
| Spelling | Spell test | Can you choose between correctly and incorrectly spelled versions of 21 difficult words? |
| Statistics | SLR model | Simulate from the simple linear regression model. The focus is on the differences between the parameters and their estimates and between the errors and the residuals |
| Power curve | Power curve for the two-sample t test and its dependence on the effect size, standard deviation, sample size, and significance level | |
| Norm Quant Plot | Produces normal quantile plots for simulated data from different distributions (normal and non-normal) and explains what is plotted on the x- and y-axes. | |
| Leverage | Displays how leverage is a measure of the statistical distance of the x- values for an individual from the center of the x-values for the dataset. | |
| Model Selection | Shows the bias/variance tradeoff involved in model selection. Specifically, underfitting can lead to bias in the regression coefficient estimates and overfitting can lead to increased variance. | |
| One-factor fixed/random | One-way fixed/random effect models | |
| Three Factor | Shows the effects of each term in the 3-factor effects model on the cell means | |
| Two factor | Simulating from two-factor models with crossed/nested and fixed/mixed/random factors |