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Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther. A small group of 15 Allen's hummingbirds has been under study in Arizona. The

Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther. A small group of 15 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is 3.15 grams. Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with = 0.33 gram. Find an 80% confidence interval for the average weights

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