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• ### Sample size and power calculations made simple

The process of sample size calculations, including relevant definitions, is explained and clear examples for different study designs are provided for illustration. A range of software packages and websites are discussed and evaluated
• ### Determining the Sample Size

Chapter from a textbook that covers the topic of sample size by giving a thorough background and then covering issues that are involved when determining the sample size.
• ### Understanding Hypothesis Tests: Significance Levels (Alpha) and P values in Statistics

Resource that gives a clear description of what the p-values and significance levels mean, and what statistical significance means. Graphs are used to illustrate the topics covered in this source.
• ### Tests of Significance

Resource that covers specific topics within significance testing, including significance levels. P-values and how to determine what qualifies as being statistically significant covered. Examples are given throughout the text to further explain the concepts.
• ### Hypothesis Tests: P-Value & Significance Level

Video that explains what p-values and significance levels are in hypothesis testing.
• ### Interpreting the P-Value and Significance Level

Video that will teach you how to interpret the P-Value and significance level for a two-tailed hypothesis test that is not rejected.
• ### Significance

Resource that covers what significance testing is and what it is used for. Describes the significance level and how it relates to the p-value with respect to hypothesis testing. A glossary of key concepts and terms is included at the end of the document.
• ### Significance Level

Short description of what the significance level is and what it takes for a result to be statistically significant.
• ### Alpha Level (Significance Level): What is it?

Text resource that covers what type I and II errors are, how to Calculate an Alpha Level for one- and two-tailed tests, and why an Alpha Level of .05 commonly used. There is also a video included at the beginning of the video to explain the topics.
• ### Type I and II Error and Significance Level

Covers topics of type I and II errors and significance levels. Common mistakes for these topics are given and the reasons they are incorrect are explained.