Bias in Survey Sampling

Here is the video version of Lesson 25 from Stat Trek's free online tutorial covering the complete curriculum for Advanced Placement (AP) Statistics.

About This Video

In survey sampling, bias refers to the tendency of a sample statistic to systematically over- or under-estimate a population parameter. This video lesson describes three types of bias that can result from unrepresentative samples: undercoverage, nonresponse bias, and voluntary response bias. It also describes two types of bias that can result from measurement problems: leading questions and social desirability. And finally, the video explains the difference between survey bias and sampling error.

A written version of the material covered in this video is available at https://stattrek.com/survey-research/survey-bias.

About Stat Trek's Video Series

A little history: About two decades ago, Stat Trek produced a free online tutorial covering the complete curriculum for AP Statistics. The tutorial, which can be found at https://stattrek.com/tutorials/ap-statistics-tutorial, was to designed to help students prepare for and pass the AP Statistics exam. Consisting of 69 easy-to-understand written lessons, the tutorial was very well-received.

Of course, there is always room for improvement. With that in mind, some students suggested supplementing the written lessons with video instruction. The Stat Trek video series is our response to that suggestion. So far, we've produced 45 video lessons, one video lesson for each of the first 45 written lessons from Stat Trek's' AP Statistics Tutorial.

The work continues. We're adding videos little by little. Eventually, we intend to have a video for each of the 69 written lessons from the tutorial.