Histograms, Bin Widths, and Cross Validation  *****
A demonstration of the effect  of bin width on histograms.A so-called "cross-validation" criterion is provided to show the quality of the histogram. Smaller values of the cross-validation function generally imply smaller errors in the approximation of density function.
See also Histogram Applet----This applet is designed to show how bin widths (or the number of bins) affect a histogram.
You can interactively change the bin width by dragging the arrow underneath the bin width scale. For large bin widths,
the bimodal nature of the dataset is hidden, and for small bin widths the plot reduces to a spike at each data point. What
bin width do you think provides the best picture of the underlying data?

Interactive Histogram  ****
This Applet is designed to illustrate a frequency or relative frequency distribution by Clicking on the horizontal axis to select points . The  width can be varied with the scroll bar. Different sets of summary statistics can be selected from a list box:
 a) Mean and standard deviation
 b) Boxplot
 c) Mean, median, and mode
 d) Median and mean absolute deviation
See also Interactive Histogram with Error Graph

Comparing distributions ****
Compare distributions of your response times under two conditions.