In an increasingly data-driven world, it is more important than ever for students as well as professionals to better understand basic statistical concepts. 100 Questions (and Answers) About Statistics addresses the essential questions that students ask about statistics in a concise and accessible way. It is perfect for instructors, students, and practitioners as a supplement to more comprehensive materials, or as a desk reference with quick answers to the most frequently asked questions.

What Are the Different Types of Correlation Coefficients?

What Are the Different Types of Correlation Coefficients?

The magnitude (size) and the value (ranging from –1.0 to +1.0) gives us lots of information about the relationship between variables and how one variable may change as another does.

If variables change in the same direction, then the correlation coefficient is direct or positive. For example, as children get taller, they generally get heavier as well, meaning that height and weight are directly or positively correlated. This correlation would have a value between .00 and +1.00.

If variables change in opposite directions, then the correlation is indirect or negative. For example, in general the faster one completes a test, the more likely there will be errors. This means that amount of time and error rate are indirectly ...

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