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A random sample of 500 adult residents of Maricopa County found that 340 were in favor...

A random sample of 500 adult residents of Maricopa County found that 340 were in favor of increasing the highway speed limit to 75 mph, while another sample of 400 adult residents of Pima County found that 308 were in favor of the increased speed limit. Calculate the test statistic in order to test if these data indicate that there is a difference in the support for increasing the speed limit between the residents of the two counties. it is my final exam. urgent!

Math   Statistics-And-Probability   
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