[单选题]

An analyst wants to estimate the return on the S&P 500 Index for the current year using the following data and assumptions:
·Sample size = 50 stocks from the index.
·Mean return for those stocks in the sample for the previous year = 0.114.
·Variance = 0.0529.
·The reliability factor for a 95% confidence interval with unknown population variance and sample size greater than 30 is z.025 = 96.
If he assumes that the S&P 500 return this year will be the same as it was last year, which of the following is the best estimate of the 95% confidence interval for this year's S&P 500 return?

A.0.09934 to 0.12866

B.0.05025 to 0.17775

C.-0.33680 to 0.56480

参考答案与解析:

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