Hi Can You Please Help Me With The Following Equation And Explain How To Get The

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Hi Can you please help me with the following equation and explain how to get the result?

For a population data set, σ=12.5

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  1. How large a sample should be selected so that the margin of error of estimate for a 99% confidence interval for μ is 2.50?
  2. How large a sample should be selected so that the margin of error of estimate for a 96% confidence interval for μ is 3.20?
 
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