Contour Plots

This is a well-designed tool for creating and exploring contour plots. It has nice customization options and you can save your plots in a wide range of formats. It comes from Bulgaria and Macedonia's Computational Science and Engineering Program.

True/False Quiz on the Probability of Combined Events

This quiz about concepts and notation associated with the probability of combined events (complementary events, mutually exclusive events, and exhaustive events) includes a link to an electronic textbook chapter on the material from CIMT.

The Volume of a Watermelon

To introduce the idea of finding the volume of a solid of revolution, have students think about finding the volume of a watermelon.

Sampling Distributions

My colleague, Julia, who teaches AP Statistics, says this applet from the Simulations and Demonstrations section of the Rice Virtual Lab in Statistics is very effective for helping students to understand the central limit theorem. After they've got the general idea using typical distributions, students enjoy going to the ActivBoard and using the feature that lets you draw your own population distribution.

\(\frac{1}{2} + \frac{1}{4} + \frac{1}{8} + . . . \)

A simple applet illustrating the sum of the geometric series \(\frac{1}{2} + \frac{1}{4} + \frac{1}{8} + . . .  \)

Sketch the Graph of an Antiderivative

Given a graph of f ' and a few points on the graph of f, find the graph of f.

Factoring Trinomials

Factor trinomials while looking at the graph of the quadratic. Some of the examples are not factorable. It is also possible to turn off the graph. There are options to time yourself or to print a worksheet of randomly generated factoring practice problems.

• Problems where a = 1
• Problems where a is not necessarily 1