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Standardised observations

An obviously useful check is to examine whether the data are consistent with the beliefs expressed about them. The simplest way of doing this is to standardise the data. Our notation for the standardised value of a datum tex2html_wrap_inline9032 is tex2html_wrap_inline9034 . For the data we saw, tex2html_wrap_inline9036 and tex2html_wrap_inline9038 ,

eqnarray823

The observation tex2html_wrap_inline8768 might be a little suspect: the Doctor's two-hour reading is more than two standard deviations distant from her expectation. The fasting measurement tex2html_wrap_inline8766 is just over one standard deviation from her expectation.



David Wooff
Thu Oct 15 12:20:04 BST 1998