If your sample size is small and your standard deviation is high, your results mean nothing. The video explains how to solve for sample size, assuming you are given the confidence, standard deviation, and error rate.

Good news! We only have a half day of school this morning. Granted, we have the other half this afternoon. The video is a visual representation of the definitions of mean and standard deviation. 

Wouldn't life be easier if a computer would do the work for us? A video shows how to use Excel to solve for standard deviation, mean, and variance statistics. 

Excel at your work with a lesson featuring spreadsheets. A video walks pupils slowly through how to solve standard deviation and variance using Excel in two different ways. 

When does 10 + 7 = 13? When you add wrong. The video walks you through solving standard deviation and variance problems by hand, including ways to check your work. 

Find the standard deviation of a set of integers. Using the formula to find the standard deviation, the instructor shows you how to apply the formula to a small set of integers.

Video reviews the population and sample mean and variance then expands to population and sample standard deviation. Gives examples of calculating the standard deviation. [13:07]

Video program shows viewers how to use standard deviation, compute relative frequencies, find percentiles, and determine whether a distribution is normal. Real-life connections made by examining data from vehicle-emissions standards and...

This lesson looks at the different measures of center and variability that are used when analyzing the spread of data in a distribution. Includes downloadable study guide with exercises - guide also covers other topics. [17:21]

This lesson discusses the normal distribution and the use of z-scores. Includes downloadable study guide with exercises - guide also covers other topics. [14:58]

This lesson looks at what effects changing the standard deviation, confidence level, and/or sample size have on the width of a confidence interval. Includes downloadable study guide with exercises - guide also covers other topics. [11:26]

The video shows how to calculate the mean absolution deviation of a data set.

The video is an example of finding the mean absolute deviation from a bar graph.

This tutorial illustrates the entire process of finding the standard deviation of a data set. [6:17]

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

A video showing why we divide by n-1 when we calculate our sample varience and why that give us an umbiased estimate of population variance.

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.

This video shows how to find a population mean from a set of data and the compute the population variance.

This video shows how to estimate the variance of a population by looking at the data in a sample.

This video is reviewing the population mean, sample mean, population variance, sample variance and building an intuition for why we divide by n-1 for the unbiased sample variance.

A video exploring standard deviation. [3:58]

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.

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

In this lesson the heights of two basketball teams are compared using histograms. The means are compared and the difference between the means is compared to the mean absolute deviation. [6:57]