# USING WEB APPLETS TO ASSIST STATISTICS INSTRUCTION

Robin H. Lock
Mathematics Department
St. Lawrence University
Canton, NY 13617 USA
rlock@vm.stlawu.edu

Presented at

1999 Joint Mathematics Meetings
San Antonio, Texas
January 15, 1999
Mathematical Association of America

Getting started:

• Browse through the applets and sites listed below.
• Set up a course webpage with links to favorite applets.  It doesn't need to be fancy.  Start off with just a few links and add more as you go along.

Quick demonstrations:

• Histogram - check the effect of bin size on Old Faithful data, Webster West - S. Carolina.
• Regression - see the effects of adding an outlier -Webster West - S. Carolina.
• Power of a Hypothesis Test -  graphical look at power for a test of a mean -Todd Ogden - S. Carolina.
• Scatterplot Changes with Correlation - another way of seeing how scatterplot shape and correlation are related.  A non-java applet by Juha Puranen at the Univ. Of Helsknki.

Student activities:

• Guessing Correlations - a neat "game" to show the relationship between correlations and scatterplots -  part of the CUWU Statistical Program at Illinois-Champaign-Urbana.
• Let's Make a Deal - a simulation of the infamous Monty Hall- Three Doors problem -Webster West - S. Carolina.
• Drawing a Regression Line by "Eye" - draw a line on the scatterplot.  MSE error is computed.  you can also guess the correlation and see the least squares line - part of the Rice Virtual lab in Statistics.

Websites with links to lots of applets:

On-line stat packages:

• Statlets - a multi-featured JAVA-based statistics package, with free WWW access for small datasets (10 variables x 100 cases). Produced by NWP Associates, Inc.
• WebStat - created by Webster West at the University of South Carolina.
• Statiscope - a one page univariate stat pakage done by Mikael Bonnier - Lund, Sweden.