Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.Suppose a small group of15Allen's hummingbirds has been under study in Arizona. The average weight for these birds isx-bar= 3.15 grams.Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with=0.24gram.

Find an 80% confidence interval for the average weights of Allen's hummingbirds in the study region. (Round your answers to two decimal places.)

lower limit__________

upper limit__________

margin of error________