Khan Academy: Statistics: Margin of Error 2

Don't leave your classes vulnerable in their calculations! Help them understand the importance of calculating a margin of error to represent the variability in their sample mean. 

Error does not mean something went wrong! Learners complete a problem from beginning to end using concepts developed throughout the last five lessons. They begin with a set of data, determine a population proportion, analyze their result...

We know that sample data varies — it's time to quantify that variability! After calculating a sample mean, pupils calculate the margin of error. They repeat the process with a greater number of sample means and compare the results.

Use the power of mathematics to find the number of red chips in a bag — it's a little like magic! The activity asks learners to collect data to determine the percentage of red chips in a bag. They calculate the margin of error and...

What did the math book say to the psychology book? I have a lot of problems. A helpful video covers how to calculate the margin of error with various standard deviation numbers. 

Video example of calculating the mean, variance and standard deviation of a sample of a Bernoulli distribution. Video is leading up to creating a confidence interval which will be shown in the next video. [15:02]

Video reviews the notation of the expected value and variance of random variables. It then explains the expected value and variance of the sum of two random variables and explains why the variance of the difference of random variables is...

Video explains the law of large numbers and why it works, including examples. Also explains the Gambler's fallacy, how it relates to the law of large numbers and why it is incorrect. Video is also included in the Probability section of...

Video is the second of two parts to demonstrate an example using election statistics to compare the population proportions of the women and men who voted for a particular candidate. The first video showed how to calculate the mean and...

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...