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For a random sample sample of size 12, one has calculated the 95% confidence interval for...

For a random sample sample of size 12, one has calculated the 95% confidence interval for μ and obtained the result (46.2, 56.9).
a) What is the length of this confidence interval?
b) What is x ̄ for that sample?
c) What is the standard deviation (s) for that sample?
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