The standard deviation of a series of observations

safaTerkawi

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2022-08-18

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The standard deviation of a series of observations.

Is related to the scatter of the observations.
Is such that about 95 per cent of observations lie within one standard deviation of the mean.
Should be calculated only if observations are normally distributed.
Is a measure of the significance of the observations.
Is a more valid expression of scatter than is the absolute range for small numbers of observations, e.g. less than five..

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safaTerkawi

2022-08-18

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A. True It increases as scatter increases.

B. False This is true for two standard deviations; for one standard deviation it is 66 per cent.

C. True Otherwise (B) above does not hold.

D. False It is only a description of the scatter of observations.

E. False It should not be calculated for very small numbers of observations.

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