Source: Video created by Todd
This formula shown in the video is incorrect.
The formula shown uses sigma and mu which is the formula for population standard deviation. But the formula also uses denominator of n - 1 which is the formula formula for sample standard deviation. So the notation here is incorrect, since this is mixing together two different formulas, for population and sample standard deviation. This is confusing for students. For sample standard deviation involving "n - 1", this should be represented as "s" and not "sigma"
Overall the video is clear and I like the basic explanation. Makes it seem like statistics is less daunting of a challenge. Not sure how to rate the completeness of the tutorial As someone who is new to statistics, its not clear how the n-1 eventually became a 4.
Sophia's online courses not only save you money, but also are eligible for credit transfer to over 2,000 colleges and universities.*
Start a free trial now.