# SOLUTION: A statistician is considering using a 99% confidence interval for a study instead of a 95% confidence interval. What happens to the required sample size if the confidence level is

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 Question 313922: A statistician is considering using a 99% confidence interval for a study instead of a 95% confidence interval. What happens to the required sample size if the confidence level is increased from 95% to 99% and the same error is required in each case?Answer by stanbon(60777)   (Show Source): You can put this solution on YOUR website!A statistician is considering using a 99% confidence interval for a study instead of a 95% confidence interval. What happens to the required sample size if the confidence level is increased from 95% to 99% and the same error is required in each case? ---------------------------- Since n = [zs/E}^2, n is directly proportion to z^2. --- So, if confidence goes up, that forces z to go up, so n must go up. ============================================================ Cheers, Stan H.