Table 4.6 refers to a sample of subjects randomly selected for an Italian study on the relation between income and whether one possesses a travel credit card (such as American Express or Diners Club). At each level of annual income in millions of lira, the table indicates the number of subjects sampled and the number of them possessing at least one travel credit card. Analyze these data.

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Table 4.6 Number Credit Number Credit Income Cases Cards Income Cases Cards 22 24 1 27 153 as I71325 0020-00- 0 48 49 28 29 30 31 32 9 5 8 60 65 33 68 34 1 70 5 35 1 79 1 38 1 80 39 84 40 94 41 2 0 120 42 2 130 45 1 1 50 10 52 1 59 1 002002633000190 -563 Source: Categorical Data Analysis, Quaderni del Corso Estivo di Statistica e Calcolo delle Probabilit, n. 4., Istituto di Metodi Quantitativi, Universit Luigi Bocconi, a cura di R. Piccarreta.