In a sample of 100 voters, 60 favour a proposal. Testing H0: p = 0.5, what is the z statistic for the proportion?
Correct answer C. 2.0
Explanation
Under H0 the standard error is √(0.5 × 0.5 / 100) = 0.05. Then z = (0.60 − 0.50) / 0.05 = 2.0.
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