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Question 1 (15 marks)

A sample of 150 subjects randomly selected for an Italian study on the relation

between annual income and whether one has 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 subject in the sample and the number of those having at least one travel credit card. Let X = annual income and Y = whether one has such credit card, where Y = 1 if one does and Y = 0 if one does not. 


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