Visualize concepts from the book by changing the variables in each module.

Please Note: It may take a moment for each module to load. We recommend you use the latest Internet Explorer or Netscape browser with this feature. These modules will not work correctly using Netscape 4.x or 6 on the Mac OS.

• Sampling Error
  This visual calculator shows that sample error is a function of sample size, sample proportion, and confidence interval. User may change sample size, sample proportion, and confidence interval.
  
  
• Percentage Table 1
  This application shows how a bivariate percentage table is constructed from raw data. The percentage table is updated as user changes raw data.
  
  
• Percentage Table 2
  An application showing a bivariate percentage table. Menus allow the user to examine subsamples of the data. Relationships evident in the full data set may not be present in subsamples.
  
  
• Normal Distribution 1
  Application shows a binomial approximation to the normal distribution. User may alter the distribution and see the effect on mean, median and standard deviation. Shows sensitivity of mean to outliers.
  
  
• Normal Distribution 2
  Application shows a normal distribution. User may change z-score via a slider bar to see how the z-score is related to area under the curve.