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Data Analysis Data Analysis Basics Getting to Know Your Data Analyzing Data Spread

Posted by Brendan Whiting
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Brendan Whiting
Front End Web Development Techdegree Graduate 84,738 Points

Standard deviation symbol is uppercase sigma?

At about 0:12 in this video it shows Σ, uppercase of greek letter sigma, as the symbol for standard deviation. Unless I'm mistaken, that symbol is commonly used for sum and the lowercase sigma, σ, is used for standard deviation.

3 Answers

Johannes Kemme
Johannes Kemme
4,072 Points
Johannes Kemme
Johannes Kemme
4,072 Points

True, maybe they should note it under the video.

Israel Bautista
Israel Bautista
1,254 Points
Israel Bautista
Israel Bautista
1,254 Points

you're not mistaken. uppercase sigma is used for Sum, lowercase for standard deviation, that needs to be corrected on the video. Makes me question the rest of the information. https://en.wikipedia.org/wiki/Sigma

lisablue
lisablue
1,392 Points

agreed

Meredith Olson
Meredith Olson
2,791 Points
Meredith Olson
Meredith Olson
2,791 Points

It's also wrong in the quiz question. It's now almost four years since the original comment about the need for correction was posted, and it hasn't been changed.