A sample of size 200 from Population 1 has 50 successes. A sample of size 200 from population 2 has 40 successes. What is the computed z-value for testing the null hypothesis that the proportion of successes in Population 1 exceeds the proportion of successes in Population 2 by 0.025?
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a.
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0.60
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b.
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1.20
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c.
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1.28
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d.
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1.96
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