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to = C.I. : 3.1 + C) A sample of 86 hummingbirds was randomly selected and gave a mean weight of 3.12 and standard deviation

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to = C.I. : 3.1 + C) A sample of 86 hummingbirds was randomly selected and gave a mean weight of 3.12 and standard deviation of 0.32 grams. Find the 80 % confidence interval to estimate the population mean weight of hummingbirds. D. F. = to = C.I. : 3.12+

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