Video: Confidence Interval
This video lesson describes confidence intervals. It explains what a confidence interval is, how to interpret a confidence interval, and how to construct a confidence interval. Key points are illustrated step-by-step with a sample problem.
About This Video Lesson
This is a video version of Lesson 51 from Stat Trek's free online tutorial covering the complete curriculum for Advanced Placement (AP) Statistics. A written version of the material covered in this video is available at https://stattrek.com/confidence-interval.
Prerequisites
In the video lesson, we refer to the margin of error, the standard error, and the critical value, topics covered in previous lessons. If you are not familiar with these terms, it may be helpful to review one or both of the following lessons:
- Lesson 49: What is the Standard Error?
- Lesson 50: What is the Margin of Error?
To construct a confidence interval, you need to know how to compute the margin of error. And to compute the margin of error, you need to know how to compute the standard error and how to find the critical value. These lessons explain how to do these things.
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 57 video lessons, one video lesson for each of the first 57 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.