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7. Suppose we sample 12 values from a normally distributed population, and find: X - 12.2, V E(X-X)2 - 6.1 11 Which one of the

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7. Suppose we sample 12 values from a normally distributed population, and find: X - 12.2, V E(X-X)2 - 6.1 11 Which one of the following is a 95% confidence interval for u? (a) (7.9,16.5) (b) (8.3,16.1) * * (c) (8.7,15.7) (d) (9.1,15.3 (e) (9.5,14.9)

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