Students can change the mean or standard deviation and see the effect on the normal curve. Students can click on the plot to verify that the mean is the center of the curve.  
Normal Empirical Rule  Define any normal distribution by specifying a mean and a standard deviation. Verify that the area within a certain number of standard deviations of the mean is not affected by the particular choice of parameters. 
Normal Calculator The calculator above takes the place of the traditional textbook table. The calculator can be used in two ways. To find Prob<Z for a Z score, enter a value in the "Area left of" box and hit "Return". The answer is given in red in the "=" box. To find the Z score for a probability, enter a value under in the "=" box and hit "Return". The Z score is given in the "Area left of" box. In each case the graphic provides a visual display of the probability in red. Note that this calculator works for any values of the mean and standard deviation. When thinking in terms of Z scores, you should use 1 as the standard deviation and 0 as the mean. 

T Demonstration  By changing the number of degrees of freedom in a tdistribution, students can see how the pdf changes. They also have the option of overlayng the standard normal curve so that they can see the convergence. 
T Calculator The calculator above takes the place of the traditional textbook table. First, enter the appropriate number of degrees of freedom in the top box. Then, the calculator can be used in two ways. To find chi square critical values, enter a probabilitiy in the "=" box and hit "Compute!". The answer is displayed in the "Area right of" box. To Find tail probabilities (or pvalues), enter the chi square value in the "Area right of" box and hit "Compute!". The probability will be displayed in the "=" box. In either case, the probability is represented graphically. 

Chisquare Demonstration  By changing the number of degrees of freedom in a chi square distribution, students can see how the pdf changes. 
Chisquare Calculator The calculator above takes the place of the traditional textbook table. First, enter the appropriate number of degrees of freedom in the top box. Then, the calculator can be used in two ways. To find chi square critical values, enter a probabilitiy in the "=" box and hit "Compute!". The answer is displayed in the "Area right of" box. To Find tail probabilities (or pvalues), enter the chi square value in the "Area right of" box and hit "Compute!". The probability will be displayed in the "=" box. In either case, the probability is represented graphically. 

Exponential Demonstration  Students can change the mean and see the effect on the plot of the exponential pdf. Students can click on the plot to see coordinates. 
Exponential Calculator The calculator above allows students to compute probabilities based on exponential distributions. The calculator can be used in two ways. To find Prob > x, enter the value of x in the "Area right of" box and hit "Compute!". The answer is given in the "=" box. To find an x for a probability, enter a value under in the "=" box and hit "Compute!". The x value is given in the "Area right of" box. In each case the graphic provides a visual display of the probability. 

Binomial Demonstration  Students can change the binomial parameters n and p and see the effect on a bar plot representing the binomial probabilities. 
Normal Approximation to the Binomial  Students can change the binomial parameters n and p and see the effect on a bar plot representing the binomial probabilities. The approximating normal distribution (mean np and variance np(1p)) is overlaid so they can determine when the approximation is good. 
Binomial Calculator The calculator above takes the place of the traditional textbook table. Students should enter the proper binomial parameters (n and p) for the distribution they are interested in calculating probabilities for. Students specify the relevant "x" value and then select among choices such as "exactly", "no more than", etc. Hit "Compute!" to get the answer. The probability is represented graphically in the plot. 

Psychic Test  Students can test their "psychic ability" to predict the future by guessing the outcome of a coin toss before it occurs. Enter your predictions by clicking the "heads" or "tails" button. When you enter your guess, the coin is tossed and the result is displayed. As you continue guessing, the applet keeps track of the total number of guesses and the total number of correct guesses, plotting it above. If you are truly psychic, you should be able to beat the odds in the long run. You can "weight" to coin by changing the probability of it landing heads. Are you a psychic? 
Let's Make a Deal  In a popular game show, contestants are asked to choose one of three doors. Behind one is a fabulous prize! Behind the others are gag gifts. When you choose a door, the game show host shows you a gag gift behind one of the two doors not chosen. You are given the option of switching to the one remaining door or staying with your original choice. Which is the better strategy: switch or stay? You choose doors by clicking on numbers and your chosen door is highlighted. A gag gift (represented by a donkey) is then revealed. Click on the highlighted door to stay, or click on the other door to switch. Then all the doors are opened. Did you win? The table keeps track of your wins and losses using each strategy. 
Java Applet  Generate a sample from a population and compare the sample mean to the population mean. 
Java Applet  Generate random samples of n=4 or n=10 
Stem and Leaf  transforming a stemandleaf display into a histogram 
Java Applet  taking samples of size 10 from a population of 100 college students 
Activity 2B  effect of class width on histogram shape 
Activity 2D  effect of outlier on mean and median 
Activity 2E  matching means and histograms 
Activity 2F  matching means and standard deviations with corresponding histograms 
Activity 3A  scatter diagrams for various correlation coefficients 
Activity 3B  matching scatter diagrams and correlation coefficients 
Activity 3C  constructing a scatter diagram for an r = 0.50 
Activity 3D  constructing a scatter diagram for an r = 0.90 
Activity 5B  calculating binomial probabilities 
Activity 6A  relationship between probability and area under a normal curve 
Activity 6B  effect of mean and standard deviation on the normal curve 
Activity 7A  sampling from a normal population 
Activity 7B  sampling from a skewed population 
Activity 7C  sampling American ages from the 2000 census 
Activity 8A  level of confidence versus width of a confidence interval 
Activity 8B  estimating the pvalue for a onetailed hypothesis test 
Activity 8C  estimating the pvalue for a twotailed hypothesis test 
Activity 9A  exploring the tdistribution for different degrees of freedom 
Activity 9B  exploring the relationship between a z* value and its corresponding confidence interval 
Activity 9C  calculating chi square values for various degrees of freedom 
Activity 10A  exploring the effect of degrees of freedom on the Fdistribution 
Activity 10B  computes probabilities for various Fdistributions 
Activity 13A  explore the relationship between residuals and the line of best fit 