Measures of Variance: Range and Standard Deviation (Intro Psych Tutorial #17)

In this video I describe two more descriptive statistics, both of which are measures of variance: the range and the standard deviation. I explain what the standard deviation tells us about a distribution of scores and how it is calculated.
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[@sakuraremell5377]

this guy is amazing how does he not have more subscribers

[@PsychExamReview]

Thanks, I hope I can help even more students too!

[@LaurenDee-tc9uh]

You are the best teacher!

[@RobertoLion]

4:30 why divide by (n-1) and not by n?
I think the squaring of each distance from the mean is to make big differences get even bigger, and the small differences not get very much bigger, as we can make them positive and not negative by taking the absolute value of each difference, right?

[@PsychExamReview]

That's exactly right, I didn't explain this in this older video but I do have a more recent video on variance which goes into detail on why squaring emphasizes extreme scores while mean absolute deviation does not.
Bessel's correction (n-1) adjusts for the underestimate caused by using the sample mean (x bar) rather than the population mean (mu), which I explain in detail in this video: ruclips.net/video/ke8nSbXUJjQ/видео.htmlsi=PE9lQNZecPoLj4Yh