In Exercises 9 –16, (a) identify the claim and state H 0 and H a , (b) find the critical value(s) and identify the rejection region(s), (c) find the standardized test statistic z, (d) decide whether to reject or fail to reject the null hypothesis, and (e) interpret the decision in the context of the original claim. 14. A research center claims that 63% of U.S. adults support using surveillance cameras in public places. In a random sample of 300 U.S. adults, 70% say that they support using surveillance cameras in public places. At a = 0.05, is there enough evidence to reject the research center’s claim?