Allen's hummingbird (Selasphorus sasin) has been studied by zoologist B Ather.t Suppose a small group of 19 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x- 3.15 grams. Based on previcus studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with a- 0.40 gram. (a) Find an 80 confidence interval for the averaçe weights of Allen's hummingbirds in the study region. What is the margin of emror? (Round your answers to two deamal places.) lower imt upper limt margin of error

Q: part c parked as wrong answer

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