The average annual return for the S&P 500 from 1886 to 2020 is 15%, with a...
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The average annual return for the S&P 500 from 1886 to 2020 is 15%, with a standard deviation of 20%. Based on these numbers, what is a 95% confidence interval for 2021's returns? OA. -25%, 55% B. -15%, 45% OC. -12.5%, 27.5% OD. -10%, 40% The average annual return for the S&P 500 from 1886 to 2020 is 15%, with a standard deviation of 20%. Based on these numbers, what is a 95% confidence interval for 2021's returns? OA. -25%, 55% B. -15%, 45% OC. -12.5%, 27.5% OD. -10%, 40%
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