# Tutorial

• ### DIG Stats: TI-83 Guide for Importing Data and Programs

This tutorial explains in detail how to import data and programs on the TI-83 graphing calculator using TI-83 Graphlink software.
• ### DIG Stats: TI-83 Guide for Determining the Confidence Interval

This tutorial explains in detail how to find a confidence interval using the TI-83 graphing calculator.
• ### DIG Stats: Excel Guide for Determining the Confidence Interval

This tutorial explains in detail how to find a confidence interval using Excel.
• ### DIG Stats: Excel Guide for Making a Scatterplot

This tutorial explains in detail how to make a scatterplot in Excel.
• ### Data+Applet : Regression by Eye

In this demonstration a scatterplot is displayed and you draw in a regression line by hand. You can then compare your line to the best least squares fit. You can also try to guess the value of Pearson's correlation coefficient.
• ### Data+Applet: Restriction of Range

This applet shows how the correlation between two variables is affected by the range of the variable plotted on the X-axis.
• ### A "Small" Effect Size Can Make a Large Difference

This applet demonstrates that even a "small" effect can be important under some circumstances. Applicants from two groups apply for a job. The user manipulates the mean and the cut-off score in order to see the effects the small changes has on the number of people hired in each group. The effects on the proportion of hired applicants from each group are displayed.(Requires a browser that supports Java).
• ### Chi Square Test of Deviations from Expected Frequencies

The applet allows users to sample from a normal distribution or from a uniform distribution. It shows the expected values and the observed values and computes the deviation. Then, a chi-square test shows if the deviations are significant for both the normal and uniform distributions.
• ### 2 x 2 Contingency Tables

This applet simulates experiments using 2 x 2 contingency tables. You specify the population proportions and the sample size and examine the effects on the probability of rejecting the null hypothesis.
• ### Dataset Example: Reliability and Regression Analysis

This applet demonstrates how the reliability of X and Y affect various aspects of the regression of Y on X.