Master the calculation of sample mean and variance with our 5-minute video lesson. Learn from practice problems and take a quiz to test your knowledge!

What is population variance, and what is its significance? Learn how to use the population variance formula, and understand population variance vs sample variance.

Learn how to calculate the variance of a discrete random variable, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge and skills.

In this lesson, learn what population variance is and the formula to calculate it. Learn the difference between sample variance and population variance and why they have different formulas.

Learn how to calculate the variance of the difference of two independent discrete random variables, and see examples that walk through sample problems step-by-step for you to improve your ...

Practice Finding Variance and Standard Deviation with practice problems and explanations. Get instant feedback, extra help and step-by-step explanations. Boost your Statistics and Probability ...

Learn about variance and compare variance vs. standard deviation. Explore how to find variance and study a sample variance problem using the steps in variation.

Learn how to calculate the standard deviation of a discrete random variable, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge and skills.

Learn how to calculate the variance of the sampling distribution of a sample proportion, and see examples that walk through sample problems step-by-step for you to improve your statistics ...

Learn about sample variance and compare it to population variance. Explore how to find sample variance using the formula and see the sample variance symbol.