Thread: find the sample size required for 95% CI
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Old July 1st, 2009, 12:12 PM
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Quote:
Originally Posted by kclark36 View Post
since the n formula divides \alpha by 2, for 95% would it be 0.025/2 for a z value of 2.240? or is it 0.05/2 for a z value of 1.96? Thanks
Since the you're looking at a 95% CI, it follows \alpha=0.05. So when calculating the z value, you use z_{0.05/2}=z_{0.025}=1.96
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