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 Statistics at Square One: Exact Probability Test 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... http://bmj.bmjjournals.com/collections/statsbk/9.shtml
 Statistics at Square One: Rank Score Tests 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... http://bmj.bmjjournals.com/collections/statsbk/10.shtml
 Statistics at Square One: The Chi-Squared Tests 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... http://bmj.bmjjournals.com/collections/statsbk/8.shtml
 Statistics at Square One: Differences Between Percentages and Paired Alternatives 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... http://bmj.bmjjournals.com/collections/statsbk/6.shtml
 Statistics at Square One: Differences Between Means 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... http://bmj.bmjjournals.com/collections/statsbk/5.shtml
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