Mean Plus One Standard Deviation. Under this rule 68 of the data falls within one standard. A common estimator for σ is the sample standard deviation typically denoted by s.
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The reason why the standard deviation is such a useful measure of the scatter of the observations is this. A common estimator for σ is the sample standard deviation typically denoted by s. If the observations follow a normal distribution a range covered by one standard deviation above the mean and one standard deviation below it.
Under this rule 68 of the data falls within one standard.
In statistics the 68 95 99 7 rule also known as the empirical rule is a shorthand used to remember the percentage of values that lie within a band around the mean in a normal distribution with a width of two four and six standard deviations respectively. So sd is a measure of the variability. If the mean of a dataset is 25 and its standard deviation is 1 6 then. Under this rule 68 of the data falls within one standard.
