In this lesson, we are going to be talking about variability. We are going to start off with just a conceptual introduction to the different kinds of ways that you could measure variability. Then we are going to be talking about range, cortex, and inter quartile range. We are going to be talking about variance and standard deviation. In particular, we are going to focus a little bit on the concept of sum of squares. We are going to be talking about population, standard deviation versus sample standard deviation and talk about the differences in their formulas. We are also going to calculate standard deviation in Excel.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
This book provides a clear and methodical approach to essential statistical procedures. It clearly explains the basic concepts and procedures of descriptive and inferential statistical analysis. This book features a new emphasis on expressions involving sums of squares and degrees of freedom as well as a stronger stress on the importance of variability.