One Numerical Variable Methods

• DIG Stats: Excel Guide for Making a 3-D Graph

This tutorial explains in detail how to make a 3-D graph using the Chart Wizard in Excel.
• 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.
• 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.
• Histograms, Bin Widths, and Cross Validation

This applet demonstrates how a histogram is affected by bin width and starting point of first bin. It also illustrates cross-validation criterion for assessing histograms.
• Regression to the Mean

This is a simulation illustrating the regression toward the mean phenomenon.
• Instructor Reputation and Teacher Ratings

This case study covers the concepts including: boxplots, stem and leaf displays, two-sample t tests, and analysis of variance. It also assesses the question, "Does an instructor's reputation affect ratings of the instructor's lecture?"
• Video: Against All Odds: 26. Small Sample Inference for One Mean

In this free online video, students discover an improved technique for statistical problems that involves a population mean: the t statistic for use when sigma is not known. Emphasis is on paired samples and the t confidence test and interval. The program covers the precautions associated with these robust t procedures, along with their distribution characteristics and broad applications."
• Kolmogorov-Smirnov Goodness-of-Fit Test (Engineering Statistics Handbook)

This page, part of the NIST Engineering Statistics handbook, describes the Kolmogorov-Smirnov goodness of fit test. It contains a graph of the empirical distribution function with the cumulative distribution function, a definition of the test, the questions it answers, the assumptions that it makes, and links to other goodness of fits tests and a case study.
• Engineering Statistics Handbook

The goal of this handbook is to help scientists and engineers incorporate statistical methods in their work as efficiently as possible.