a) A grocer wishes to see whether the median number of itemsbought on each sale could be considered to be 10, so he observes 12customers at the checkout counter.  b)Can the Wilcoxon test beused? c) Which assumptions of the model are violated in thisproblem? d)Solve using the Wilcoxon signed-ranks test.   Customer Number of Items Customer Number of Items 1 22 7 15 2 9 8 26 3 4 9 47 4 5 10 8 5 1 11 31 6 16 12 7

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