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That second audit has now been questioned on many grounds including the fact that, through a set of careless procedures, the observers could have been duped when selecting a random sample of centres to audit.
ECONOMIST: A bug's life
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From the people who join the page I'll be selecting a 'stratified sample' (that's my statistics GCSE maths coming in there) to analyse for my experiment.
BBC: Facebook profile photo experiment goes live
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In the sample of of files reviewed, we noted that the main criterion for selecting a particular contractor appeared, in many cases, to be the purported availability of the contractor to commence the works within a reasonable timescale (which Property Conservation officers advised us in interview was considered to be approximately six weeks from instructions).
BBC: Edinburgh statutory repairs reports