Question: Items from a production line can have defects A or B. Some items have both, some just one, but most have neither. Tables (a) and

Items from a production line can have defects A or B. Some items have both, some just one, but most have neither. Tables (a) and (b) show two alternative sets of joint probabilities:

(a) A Total B B 0.02 0.08 0.18 0.72 0.20 0.80 Total 0.10 0.90 1.00 Test for independence in each case. (b) A

(a) A Total B B 0.02 0.08 0.18 0.72 0.20 0.80 Total 0.10 0.90 1.00 Test for independence in each case. (b) A Total B B 0.06 0.04 0.14 0.76 0.20 0.80 Total 0.10 0.90 1.00

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