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Given a confidence interval of 95% :

  • α=10.95=0.05
  • zα/2=z0.05/2=z0.025=1.96

Given a confidence interval of 99%:

  • a = 1 - 0.99 = 0.01
  • z a/2 = 0.01 / 2 = z 0.005 = 2.576

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