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It's easier to show if you have a graph of all your data. Basically a standard deviation will show the values about a mean. For example just say your mean is 25 and your standard deviation is 7, then values +/- 7 of 25 will be considered reliable results.So anything from within the range of 18 to 32 is considered reliable.The smaller your standard deviation with the most values within range, the better.t's easier to show if you have a graph of all your data. Basically a standard deviation will show the values about a mean. For example just say your mean is 25 and your standard deviation is 7, then values +/- 7 of 25 will be considered reliable results.
The standard deviation and the arithmetic mean measure two different characteristics of a set of data. The standard deviation measures how spread out the data is, whereas the â¦ arithmetic mean measures where the data is centered.ctually, there IS a relationship between the mean and standard deviation. A high (large) standard deviation indicates a wide range of scores = a great deal of variance. Generally speaking, the greater the range of scores, the less representative the mean becomes (if we are using mean to indicate normal).