These provide novel data problems for students to solve. Answer feedback is revealed when the student's are ready to see the answer.

- Practice rounding to the nearest whole number
- Practice rounding to the nearest hundreth point after the decimal
- Practice summation for a single variable
- Practice summation for two variables
- Practice central tendency: Mean, median, and mode
- Practice dispersion: Variance and standard deviation
- Practice correlation: Pearson's r
- Practice regression: Slope and Y-intercept
- Practice simple probability
- Practice z-test decisions with critical values
- Practice z-test decisions with p values
- Practice the independent-samples t-test
- Practice making decisions from p values
- Practice the related-samples t-test
- Practice the chi-square goodness-of-fit test

The following pages perform basic statistics calculations from small data sets of comma separated values. These are useful for quick and easy in-class demonstrations. No special hardware or software is required.

- Descriptive statistics: Central tendency and dispersion
- Summation statistics
- Summation statistics for two variables
- Correlation and regression
- Binomial probability distribution generator
- One-sample z-test (normal deviate test)
- One-sample t-test
- Independent-samples t-test with effect size
- Dependent-samples t-test (related-samples t-test, paired t-test) with effect size
- Cohen's d effect size for t-tests from descriptive statistics
- Analysis of variance (ANOVA) with effect size
- Eta squared effect size for one-way ANOVA from sums of squares
- Chi-square: Goodness-of fit
- Chi-square: Independence

These examples are based on random data to illustrate what correlation and statistical tests might be like under null hypothesis conditions.

- Correlation coefficients based on random data
- Independent-samples t-test based on random data

- Standard normal curve table function
- t-test critical value table function
- Analysis of Variance (ANOVA) critical values
- Correlation coefficient critical values
- Chi square test critical values

These calculators were created by Gary Fisk, Ph.D., for statistics instruction. These are provided for free: no cost (free beer) and liberty (free reuse). These pages are licensed with an open educational resource (OER) license: Creative Commons Attribution 4.0 International License that allows sharing, adapting, and remixing. These resources are intended for classroom-exercises, not professional-level scientific research. No guarantee of accuracy is given.

This WebStatsCalculators file has all of the above pages and associated files for easy download and sharing. The files must be kept together in the same folder because some files are linked together. People who reuse these files should aim to host the files on their own learning management site.

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