Khan Academy: Simulation Showing Bias in Sample Variance

Examples of bias in surveys.

See why we use t statistics when building confidence intervals for a mean using the sample standard deviation in place of the population standard deviation.

Video explaining how the Fibonacci series and other number series show up in plant growth patterns. [6:07]

This video demonstrates how to take linear equations written in either slope-intercept form or point-slope form and rewrite them in standard form of a linear equation. Right-click on the square at the bottom right for a full-screen view....

This video uses a simulation to better understand why we divide by n-1 when we calculated an unbiased sample variance. When we are in an unbiased way trying to estimate the true population varience.

Using a 2002 California Gray David recall vote as an example, young statisticians  identify sources of bias in samples and find ways of reducing and eliminating sampling bias. They consider ways to select random samples from a...

Practice problems identifying bias.

Video example of what a Bernoulli distribution is. Demonstrates how the general formulas for the mean and variance of the distribution are derived. [6:59]

This video includes several sample problems that involve finding the equation of a line in slope-intercept form. This video is also found in the strand Algebra: ck12.org. [14:58]

Video shows how to write a transformation matrix in R^3 that rotates a vector around the x-axis. Compares the rotation matrix in R^3 to the rotation matrix in R^2 found in the previous video and discusses how it could be applied for more...