Suppose an experiment will randomly divide 40 cases between two possible treatments, A and B, and will then record two possible outcomes, Successful or Not successful. The outline of a two-way table is shown in Table 2.20. In each case below, fill in the table with possible values to show: 

(a) A clear association between treatment and outcome. 

(b) No association at all between treatment and outcome.

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Table 2.20 Fill in the blanks to show (a) Association or (b) No association Successful Not successful Treatment A Treatment B Total Total 20 20 40