In 1970, 590 students among 1000 randomly selected college freshmen thought that capital punishment should be abolished. In 2005, 480 students among 1000 randomly selected college freshmen thought that capital punishment should be abolished. What is the two-sample z test statistic for evaluating the null hypothesis that the percentage of students who support capital punishment did not change from 1970 to 2005? Round your answer to two decimal places.

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