14.30 A sample of five law firms has been selected from each of three major cities for the purpose of obtaining a quote for legal services on a relatively routine business contract. The quotes provided by the fifteen firms are as shown in the accompanying table. At the 0.05 level of significance, does it seem that the population median bids from the cities’ firms could be the same?

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City A City B City C 452 439 477 469 461 460 430 487 496 403 431 484 456 401 423