Sophia Learning
Sophia: Z Test for Population Means: Lesson 3
This lesson will explain hypothesis testing when the population standard deviation (sigma) is known. It is 3 of 5 in the series.
Sophia Learning
Sophia: Z Test for Population Means
Calculate z-statistic of a population mean. [9:44]
Bozeman Science
Bozeman Science: Standard Deviation
In this video, Paul Andersen explains the importance of standard deviation. He starts with a discussion of normal distribution and how the standard deviation measures the average distance from the mean, or the \"spread\" of data. He then...
Bozeman Science
Bozeman Science: Standard Error
Paul Andersen shows you how to calculate the standard error of a data set. He starts by explaining the purpose of standard error in representing the precision of the data. The standard error is based on the standard deviation and the...