KEY FEATURES: Introduces students to developing research questions and shows their importance in driving research design. Rarely taught topics, such as how to enter and clean data, offer students information missed in both research methods and statistics courses. Shows how to write up survey results for academic, business and nonprofit reports to alleviate the confusion students feel about how to write up findings. Rigorous treatment of sampling focuses on many sampling issues from probability theory to weighting. Offers the process of actually conducting a survey with advice on administering surveys, incentives, and improving response rates.

How Do We Know if the Sample Size Is Large Enough?

Erin Ruel

This question is asking how large of a sample is needed in order to answer the research question with statistical significance. If a true relationship exists in the population, but our sample size is too small, then the association between our two concepts (effect size) will not be statistically significant. We will falsely reject that there is a relationship between them. We call this the “power” to detect an effect.

There are several online freeware applications that can help us determine the correct sample size. Before we can use them, however, we need to know some terms that go into the power analysis equation. We need to know “Alpha,” “Beta,” and the “effect ...

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