J. Orthod.
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Journal of Orthodontics, Vol. 27, No. 4, 340, December 2000
© 2000 British Orthodontic Society

Erratum

In Part I of the Statistics Series which appeared in Journal of Orthodontics Volume 27 Number 3 September 2000, an error was printed on page 270, second column. Lines 4 to 8 are reprinted below as they should have appeared.

Oxford University Press and the Editors apologise to the author and subscribers for this error.

Usually, a 95 per cent confidence interval (CI) is calculated. This is defined as ± t x SE. SE denotes the standard error of the mean, which is SD{surd}n, here 124{surd}20 = 22•6. It expresses the precision of the sample mean. The multiplier, t, is approximately 2 for a 95 per cent CI.





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