I have a question in regards to standard deviation.
School is so great just to tell us just to use the calculator to get the standard deviation, but I was just wondering the actual formula, but I keep getting two 'versions' and I am not sure which should be used? Are they both lowercase sigma like I have written? When do you use them? THANK YOU!
\(\displaystyle \large\sigma = \sqrt {{{\sum {(x - \overline {x})^2} } } \over n} \cr\)
OR
\(\displaystyle \large\sigma = \sqrt {{{\sum {(x - \overline {x^})^2} } } \over {n - 1}} \cr\)
Random1
School is so great just to tell us just to use the calculator to get the standard deviation, but I was just wondering the actual formula, but I keep getting two 'versions' and I am not sure which should be used? Are they both lowercase sigma like I have written? When do you use them? THANK YOU!
\(\displaystyle \large\sigma = \sqrt {{{\sum {(x - \overline {x})^2} } } \over n} \cr\)
OR
\(\displaystyle \large\sigma = \sqrt {{{\sum {(x - \overline {x^})^2} } } \over {n - 1}} \cr\)
Random1