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You want to construct a 95% confidence interval for the performance of a large population of...

You want to construct a 95% confidence interval for the performance of a large population of mutual funds. Assume returns are independent across funds, and the standard deviation of fund returns is 8.1 %. If you want the width of your interval to be 2.4 %, what sample size must you collect? Assume sample is large enough that the sample mean is normally distributed. Enter answer as the smallest integer sample that will accomplish your objective. I need it to be done on excel and please show the steps.

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4 Average Standard deviation Sample size Confidence interval Significance level 6.00 8.10 40 Fill this number by trial and error 95% 0.05 10 Confidence interval 2.5 12 13e. Average Standard deviation Sample size Confidence interval Significance level 4 8.1 40 0.95 Fill this number by ti 100 Confidence interval -CONFIDENCE.NORM(D8,D5,D6) 12 13 141 15

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