dtan5457
  • dtan5457
Can someone explain these standard deviation symbols?
Mathematics
schrodinger
  • schrodinger
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dtan5457
  • dtan5457
geerky42
  • geerky42
Well, \(\overline x\) means "sample mean"
geerky42
  • geerky42
And standard derivative is sum of all \((x_i+\overline x)^2\) divide by how many \(x_i\) there are (there are 5 \(x_i\)'s in your table.)

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anonymous
  • anonymous
The \(\bar x\) will be the same for every row.
anonymous
  • anonymous
The mean \(\bar x\) is just the average of the \(x_i\) column. The variance \(\sigma^2\) will be the average of the \((x_i - \bar x)^2\) column. The standard deviation \(\sigma\) is just the square root of variance \(\sigma ^2\). Since there are \(5\) rows, average is just summing the column and dividing by \(5\).
geerky42
  • geerky42
Trust Wio lol. I just did quick google.

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