Question 1037333: Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† Suppose a small group of 17 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with σ = 0.34 gram.
(a) Find an 80% confidence interval for the average weights of Allen's hummingbirds in the study region.
Upper Limit?
Lower Limit?
Margin of Error?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! Ho=weight 3.15 gm
Ha:it isn't
alpha=0.20
test stat is t df=17, 0.90
critical value |t|=1.337
SE 0.34/sqrt(17)
width of one side is 1.337*0.082=0.110
80% CI (3.04,3.26)
3.15 +/-0.110
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