8. Suppose the price of a stock is normally distributed with mean µ and variance o² = 4. In 5 days the following values have been observed: (x₁,...,x5) = (8, 10, 21, 14, 9). Which of the following is a 95% confidence two-sided interval for the parameter u? A [10.647, 14.153] B[8.48, 16.32] C[10.929, 13.871] D [8.939, 15.861]

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