closes #1

ideas_about_data.qmd

@@ -128,7 +128,7 @@ Measures of dispersion describe the spread of values around the centre and indic
 
 -   the interquartile range: two values, the first quartile and the thrid quartile. The first quartile is half way between the median value and the lowest value when the values are arranged in order and the third quartile is halfway between the median value and the highest value 
 
--   the variance: the average of the squared differences between each value and the variable's mean, $\bar{x} = \frac{(\sum{x - \bar{x})^2}}{n - 1}$
+-   the variance: the average of the squared differences between each value and the variable's mean, $s^2 = \frac{(\sum{x - \bar{x})^2}}{n - 1}$
 
 -   the standard deviation: the square root of the variance.