There are many types of sampling methods because different research questions and study designs require different approaches to ensure representative and unbiased samples.

Practice identifying which sampling method was used in statistical studies, and why it might make sense to use one sampling method over another.

Learn statistics and probability—everything you'd want to know about descriptive and inferential statistics.

Every good investigation begins with a good question! Learn how to form questions and gather data to explore those questions. You'll also learn about some investigative techniques, …

If I take a sample, I don't always get the same results. However, sampling distributions—ways to show every possible result if you're taking a sample—help us to identify the different results …

Practice identifying which sampling method was used in statistical studies, and why it might make sense to use one sampling method over another.

Statistics is all about forming questions and gathering data to explore those questions. This unit connects these questions to aspects of research design, including sampling and survey …

In the case of nonresponse bias, a particular group is left out of the survey, so their answers aren't represented in the results. In addition to nonresponse bias, another type of response bias is …

This video is to just give you a little bit of the vocabulary and a little bit of a taxonomy on the types of studies that you'll see in general, which is especially useful to know when you're exploring …

Writing hypotheses for a significance test about a mean Conditions for a t test about a mean Reference: Conditions for inference on a mean When to use z or t statistics in significance …