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Researchers studying the number of electric fish species living in various parts of the Amazon
basin were interested in whether the presence of tributaries affected the local number of electric
fish species in the main rivers (Fernandes et al. 2004) They counted the number of electric fish
species above and below the entrance point of a major tributary at 12 different river locations.
Here is what they found: What is the 95% confidence interval of the difference of means, <d< ?
Round your answers to two decimal places.

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