Standard deviation | how to calculate the SD and variance

In this video, we will see how to calculate the sample standard deviation (SD) and the variance based on a simple example, as well as how to interpret these measures.
1. How to calculate the sample SD (0:58)
2. How to interpret the SD (03:42​)
3. How to calculate the sample variance (05:38)
4. A comparison between the SD and the IQR (07:08)
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[@gr329]

You're the best. Thank you.

[@gavinjohn]

Wonderful, thank you very much.

[@ela6865]

pefect thanks

[@jonathanrush9760]

at around 5 minutes, where did you get 68%?

[@tilestats]

If you move 1 SD away from the mean, you cover 68% of the data if the data is normally distributed. kzbin.info/www/bejne/boDOeKqJabyKhpY

[@samkab677]

If we have one element what is it's standard deviation?

[@tilestats]

The SD cannot be computed for only one data point.

[@samkab677]

@@tilestats based on your experience.. what would you suggest instead?

[@tilestats]

Since SD i a measure of spread, it make no sense to compute such measure if you only have one data point. The only way is to collect more data if you like to estimate the SD.