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 Is a Research Hypothesis, and How Is It Used?

What Is a Research Hypothesis, and How Is It Used?

The null is a statement of equality—a starting point at which there is no relationship between variables. The research hypothesis, in contrast, is a statement that there is a relationship between variables. That relationship can take many different forms. Most importantly, research hypotheses are statements of inequality.

For example, a research hypothesis might posit that a difference in income exists between homeowners and renters, a difference exists between urban and rural residents in their attitude toward recycling, or a correlation (or relationship) exists between years playing contact sports and head injuries. In all these cases, given the information that we have (such as a review of the literature or the results of previous research), a ...

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