The average return on stock market investments is an annual percentage rate of 10%. Construct a 95% confidence interval for the Columbus fund whose average annual return on investment has been 12% per year with a standard deviation of 15% and sample size of 18 years.
5.84% - 18.15% |
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4.54% - 19.45% |
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1.75% - 22.24% |
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10% - 15% |
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