Khan Academy: Confident Intervals: Small Sample Size Confidence Intervals

Have you ever wondered about the proportion of ducks it would take to equal one bear's weight? (It's 423.) The video walks through how to solve for sample size when you already know the confidence, error, and proportion. It also graphs...

There are too many equations to memorize, but a helpful trick will make it easier. When you start with the confidence interval equation, the video walks through how to solve it and create the sample size equation.

Be confident about your ability to understand statistics. The 20th installment of the Crash Course Statistics playlist, the informative YouTube video describes the meaning of confidence intervals and how they relate to normal...

Video shows visually and reviews notation for sampling distributions of random variables. It then visually shows the distribution of the mean of the difference of two random variables and gives the formulas for the mean and variance of...

Formulas for the mean and standard deviation of a sampling distribution of sample proportions.

This video goes over the formulas for the mean and standard deviation of a sampling distribution of sample proportions. [9:56]

Techniques for random sampling and avoiding bias.

Worked example identifying sample study.

In this video, a simulation is used to demonstrate the sampling distribution of sample proportions. [4:34]

Highlight intervals on the domain of a function where it's entirely positive or entirely negative. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.