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  • Sample Sizes

    This resource discusses sample sizes and how they are chosen.

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  • Margin of Error

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

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  • Per Capita

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

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  • Percent Change

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

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  • Median

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

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  • Mean

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

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  • **Statistics Every Writer Should Know

    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.

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  • Dataset: Elderly vs. Young Comparison

    This dataset comes from two studies, one of 16 healthy young subjects and another of 14 healthy elderly subjects, each given a drug in two treatment periods. Blood samples were taken, and plasma levels were recorded. Questions from this study refer to whether age or gender affects plasma level. A text file version of the data is found in the relation link.

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  • Dataset: Multiple vs. Single Dose Comparison

    This dataset comes from a study of 14 healthy subjects given one dose of a drug for seven days. Blood samples were taken before and after treatment, and plasma levels were recorded. Questions from this study refer to the increase in plasma level after treatment. A text file version of the data is found in the relation link.

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  • Dataset: Dose Proportionality Study II

    This dataset comes from a study of 24 healthy subjects allocated to 1 of 4 doses of a drug. Blood samples were taken and plasma levels were recorded. Questions from this study refer to the relationship between plasma level and dose. A text file version of the data is found in the relation link.

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