The following two resources are good videos to reinforce what we did in class, and help you improve your notes. Neatness and completeness count. Please don’t just give me back my board notes; fill in the narrative. Demonstrate your understanding. I don’t want the first draft that you did in class. Make it something worth saving for future use.
Don’t be put off if you see the lecturer talk about dividing by (n-1) instead of n. I will go over that part tomorrow. (n-1) is used when you use a sample from a data set, as opposed to the whole set of data.
There are lots of Youtubes on this topic, but this one is pretty good about going over what the standard deviation is, how to find it. Time: 17:25
The following one gives a good explanation of with a different emphasis. Time: 3:42 (That is 3 minutes and 42 seconds.)