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Martin, E., & McFerran, T.  (2008). standard deviation. Oxford Reference. Retrieved 18 Jan. 2021, from https://www.oxfordreference.com/view/10.1093/acref/9780199211777.001.0001/acref-9780199211777-e-10272.

Martin, Elizabeth, and Tanya McFerran. "standard deviation." Oxford Reference. 2008. Oxford University Press. Date of access 18 Jan. 2021, <https://www.oxfordreference.com/view/10.1093/acref/9780199211777.001.0001/acref-9780199211777-e-10272>

Martin, Elizabeth, and Tanya McFerran. "standard deviation." Oxford Reference. 2008; Accessed 18 Jan. 2021. https://www.oxfordreference.com/view/10.1093/acref/9780199211777.001.0001/acref-9780199211777-e-10272.