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SSC Statistics QUESTION #2006
Question 1
A 99% confidence interval for the difference between two population proportions \(p_1 - p_2\) uses the critical value \(z_{\alpha/2}\) equal to:
  • 1.645
  • 1.960
  • 2.326
  • 2.576✔️
Correct Answer Explanation
For a 99% confidence interval, \(\alpha = 0.01\) and \(\alpha/2 = 0.005\). The corresponding standard normal critical value is \(z_{0.005} = 2.576\). This is the value beyond which only 0.5% of the standard normal distribution lies in each tail.