In a COVID infection study, n = 110 CO positive (+) and n = ID negative (-) participants who have taken the diagnostic testing this year (2022) are identified. Each participant is asked whether he/she was infected last year (2021). It is found that 60 out of the 110 COVID positive participants and 70 out of the 110 COVID negative participants have answered YES. (a) Complete the following 2 × 2 contingency table by filling the blanks (1)–(8). Year 2021 Column Total + Year 2022 + (1) (4) (7) (2) 58 Row Total (3) (6) 220

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