This section of an online textbook discusses calculating the exact probability using observed sets of frequencies, constructing frequency tables, and computing p-values. Exercises and answers are...

This site is part of an online textbook and discusses non-parametric tests. It explains the calculations, assumptions, and uses of the Wilcoxon ranked sum test. How to treat unpaired and paired...

Through example, this site discusses aspects of the chi-squared distribution and how it is carried out, demonstrated through formulas and calculations. It explains 2x2 tables and its relation to the...

This topic from an online textbook discusses standard error, confidence interval, and significance testing for a difference in percentages or proportions. It also covers paired alternatives and...

This section of an online textbook examines testing for differences of two means and the standard deviation and confidence interval for a difference in two means. It also explains the null and...

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