Resource Library

This dataset comes from a study of 48 hypertensive patients given one of 3 doses of one drug and one dose of another drug. Questions from this study refer to associations and relationships between the drugs. A text file version of the data is found in the relation link.

This site provides an introduction to basic statistical concepts for journalists and writers with little math background. Key Words: Mean; Median; Percent Changes; Per capita; Rates; Standard Deviation; Normal Distribution; Margin of Error; Confidence Interval; Data Analysis; Sample Sizes; Statistical Tests; Student's T.

This resource defines and explains the arithmetic mean using an example on employee salaries.

This resource defines and explains the median using an example on employee salaries.

This resource defines and explains percent changes using an example on city murder rates.

This resource defines and explains per capita rates using an example on city murder rates.

This resource explains margin of error using an example on presidential popularity polls.

This resource discusses sample sizes and how they are chosen.

This resource explains the t-distribution and hypothesis testing (informally) using an example on laptop quality.

This dataset comes from a study on 200 rats (100 of each gender) which were given one of 5 treatments, and then allowed to mate. At delivery, information on the pups was collected, and a sample of 8 pups (4 of each gender) was chosen from each litter. Body weights for these pups were recorded once a week for three weeks. Questions this study focused on refer to the safety of the treatments. A text file version of the data is found in the relation link.