Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:d See MacWhinney and Snow (1985). e Satterthwaite’s method used, due to unequal variances. Note : The 15 children reported by Hall et al. (1984) were each tested over a 2-day period.
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