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  • Dataset Example: DIG Stats: Acid Rain Activity

    In this activity, students will perform a one sample t-test to see if the pH level of rain collected by the EPA is less than the pH standard for acid rain (5.6). Questions about the exercise and links to a t-test applet and TI-83 instructions are given. The data exist in Excel, TI-83, and text formats.

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  • Dataset Example: DIG Stats: Airport Activity

    In this activity, students will calculate the correlation and generate a scatterplot of the number of passengers flying and the number of performed departures from 135 airports in the US. Questions about the exercise and links to Excel and TI-83 instructions are given. The data exist in Excel, TI-83, and text formats.

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  • DIG Stats: Excel Guide for Performing an ANOVA

    This tutorial explains in detail how to perform an ANOVA in Excel.

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  • 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.

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  • Regression to the Mean

    This is a simulation illustrating the regression toward the mean phenomenon.

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  • JAVA Comparing distributions

    This simulation shows recorded response times on a simple motor task under two conditions. Various statistics and graphs used to compare the distributions are presented.

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  • Unequal n ANOVA and Types of Sums of Squares

    This simulation illustrates types of sums of squares in a 2 x 3 ANOVA.

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  • Robustness of t test and ANOVA

    This applet lets you explore the effect of violations of the assumptions of normality and homogeneity of variance on the type I error rate and power of t tests (and two-group analysis of variance).

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  • Weapons and Aggression

    This case study addresses the question: "Does the mere presence of a weapon increase the accessibility of aggressive thoughts?" It concerns the following concepts: quantile and box plots, stem and leaf displays, one-sample t test, confidence interval, within-subjects ANOVA, and consequences of violation of normality assumption.

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  • Magnets and Pain Relief

    This case study assesses the question, "Can the application of magnetic fields be an effective treatment for pain?" It addresses concepts including: boxplots, stem and leaf displays, correlated t-test, two-sample t-test, repeated measures analysis of variance, and analysis of covariance.

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