Amajor car manufacturer was interested in whether its midsize car was selling consistently in two markets with respect to the annual income of the car purchasers. five-hundred new car buyers in chicago and miami were surveyed. in chicago, the following pattern was observed: < $20,000 5%; $20,000-$29,999 0%; $30,000-$39,999 40%; $40,000-$49,999 30%; ≥ $50,000 5%. among those surveyed in miami, 20 earned under $20,000; 70 earned between $20,000 and $30,000; 265 earned between $30,000 and $40,000; 125 earned between $40,000 and $50,000; and 20 earned more than $50,000. using the data provided, the calculated value of |2 =