Question

What is the formula for determining sample size?

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Answer 1

Answer:

Z 1-α /2 is the value from the standard normal distribution

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Answer 2

Answer:

The formula for determining sample size to ensure that the test has a specified power , where a is the the selected level of significance and Z 1-a/2 is the value from the standard normal distribution holding 1- a/2 below it. For example , if a=0.05, then 1- a/2 = 0.975 and Z=1.960

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