Conceptual Learning with Interactive Applets is a project to build highquality webbased applets and supporting resources for enhancing conceptual understanding in undergraduate mathematics and statistics. Our applets are built using GeoGebra.
The project is based in the University of Melbourne, School of Mathematics and Statistics, and funded by a University of Melbourne Learning & Teaching Initiatives grant.
Select a subject to view applets for that subject, or browse the full collection below.

This applet explores the velocity vector of a parametric curve, and its relationship to the chord r(t+h)r(t) and the difference quotient.

This applet illustrates the connection between a confidence interval, a formal hypothesis test, and the pvalue of a hypothesis test.

This applet gives a visualisation of the concept of statistical power, and helps illustrate the relationship between power, sample size, standard deviation and difference between the means.

This applet illustrates partitioning of variability into explained (fitted) and unexplained (residual) variability.

This applet illustrates the partitioning of variability into explained and unexplained variability, in the context of ANOVA.

This applet illustrates the effect of a linear transformation in R2 on the unit circle/unit disk, and the geometric meaning of eigenvectors, eigenvalues and determinant.

This applet displays the distribution for the order statististics of a sample of size n from an arbitrary population distribution.

This applet shows the maximum likelihood estimator and (log) likelihood function for several statistical models.

This applet illustrates the εδ definitions of the limit and continuity of a function. It can be used to investigate (non)convergence or (dis)continuity of real functions, including the Dirichlet everywhere discontinuous function and variants.

This applet illustrates the definition of derivative as the limit of the gradient of a chord.

This applet illustrates the εM definition of convergence of a sequence.

This applet illustrates upper and lower Riemann sums and refinement of partitions.

This applet shows the relationship between terms of a sequence and the partial sums of a series. It also allows exploration of some important sequences & series including geometric and harmonic sequences.

This applet explores the normal approximation to the binomial distribution.

This applet shows the construction of the inverse of a function, and can be used to explore whether the inverse is a function.

This applet plots and traces a parametric curve, given as a vector function in R2.

This applet plots two parametric curves simultaneously. It can be used to explore whether two particles collide.

This applet explores the relationship between the pmf or density and the cumulative distribution function of a range of discrete and continuous probability distributions.

This applet explores a logistic population growth model with no harvesting. The phase plot is shown alongside the plot of p vs t.

This applet explores a logistic population growth model with constant harvesting.

This applet shows the relationship between a plot of an estimated empirical CDF and a normal probability plot.

This applet explores QQplots for a range of distributions.

This applet simulates a spring acting under gravity, subject to drag and an external driving force.

This applet illustrates the concept of independent identically distributed random variables.

This applet aims to demonstrate visually the projection of a vector u onto a vector v.

This applet illustrates how the distribution of the sample mean converges towards normality as sample size increases.

This applet calculates the zygote and adult allele and genotype frequencies according to the FisherHaldaneWright model of population genetics, and plots the results.

This applet iterates a difference equation (also known as recurrence relation) and displays the resulting sequence both graphically and numerically.

This worksheet performs iteration and produces cobweb diagrams for a firstorder difference equation (AKA recurrence relation, discrete dynamical system).

This applet shows a linear approximation to a nonlinear difference equation close to an equilibrium, using cobwebbing. It can be used to investigate the accuracy of a linear approximation, or to motivate the linear stability criterion for equilibria of a firstorder difference equation.

Guess the correlation of a sample of bivariate data drawn from a linear or nonlinear population.

Repeatedly sample from a bivariate population, and construct a histogram of sample regression line slope.

These applets illustrate the solutions of two partial differential equations from the MAST20029 Engineering Mathematics lecture notes.

This applet displays the direction field and solutions for an ordinary differential equation (ODE), and calculates approximate solutions using Euler’s method.

This applet investigates the continuity of a 2branch piecewisedefined function.

This applet investigates the continuity of a piecewisedefined function.

This applet displays the direction field and solutions for an ordinary differential equation (ODE).

This applet explores how the rate of change of a composite function y = f(g(x)) depends on the rates of change of both f and g.