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a. A random sample of 400 District of Columbia residents from Ward 4 shows that 67% favor statehood for the District. Construct a 95% confidence

a. A random sample of 400 District of Columbia residents from Ward 4 shows that 67% favor statehood for the District. Construct a 95% confidence interval for the percentage of Ward 4 residents who favor statehood.

b. A random sample of 400 District of Columbia residents from Ward 3 shows that 58% favor statehood. Test the hypothesis that the support for statehood is the same in Wards 3 and 4. ( = .01)

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