A pharmaceutical marketing group studied the ailments of anxiety suffers. The group found that of 9600 adults who suffer from anxiety, 2496 have chronic backaches. Of 11,500 adults who do not suffer from anxiety, 1380 have chronic backaches. At = 0.05, is there enough evidence to support the claim that the proportions of adults who have chronic backaches are the same for the two groups? Use the rejection region method.