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From a sample of 41 monthly observations of the S&P Mid-Cap index, the mean monthly return is 1% and the sample variance is 36. For which of the following intervals can one be closest to 95% confident that the population mean is contained in that interval? A. 1.0% ± 6.0%. B. 1.0% ± 1.6%. C. 1.0% ± 1.9%. |