Nordion has developed a medical device that inserts a radioisotope inside a patient’s liver for the treatment of liver cancer. About half of the world’s liver cancer patients are in China, and Nordion is planning to market the technology there, using methods that include making presentations at medical conferences. Suppose that a survey of 344 randomly selected oncologists from three cities at such a conference gave the following responses to the question of usefulness of the device:

Is there a difference among the cities as to the acceptability of the device at the 95% significance level?

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Guangzhou 42 41 19 102 Total 165 Shanghai Beijing 34 27 20 81 Very useful Acceptable 89 41 31 161 109 70 Too costly Total 344