To see details on the word standard deviation please enable javascript.
Go to New Version of This Page
This old version has not been updated since 2016,
but we're leaving it in case you prefer it. Show What's New
Please update your links from the new version.
standard deviation
The top 5% are two standard deviationsabove the mean.
A measure in statistics of how far a set of data is from its average
(calculated as the square root of the variance — the variance being the average of the squares of deviations about the mean of a set of data)
In a normal curve, 68% of the numbers are within 1 standard deviation and 95% are within 2 standard deviations.
A normal curve (also called a bell curve) occurs frequently. For example, people’s height, weight, and IQs all plot to a normal curve. Many random events such as flipping a coin or measurement errors also plot to a normal curve.
Beyond normal curves, in any curve, at least 75% of data are within 2 standard deviations.
The top 5% are two standard deviations above the mean.
The standard deviation of each section of the SAT test is very roughly 95.
There is not a single standard deviation for all IQ tests, but 15 may be most common.
But the very next day, his first Monday up here as a visitor, brought another standard deviation from the routine—and that was one of the lectures Dr. Krokowski gave in the dining hall every two weeks before the entire German-speaking, nonmoribund, adult population of the Berg-hot.