Suppose that a travel bureau claims that the trees in a forest are 83 feet tall on average, with a standard deviation of 2 feet. If you took a sample of 64 trees, which of the following mean heights would be outside the 95% confidence interval?
A. 83.2 feet
B. 83.4 feet
C. 82.8 feet
D. 83.6 feet

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this is the same problem as your "customer service" problem, but with different numbers

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