a hospital director is told that 30% of the emergency room visitors are uninsured. the director wants to test the claim that the percentage of uninsured patients is not the expected percentage. a sample of 140 patients found that 35 were uninsured. at the 0.02 level, is there enough evidence to support the director's claim? step 2 of 7 : find the value of the test statistic. round your answer to two decimal places.