Allen's hummingbird ( Selasphorus sasin ) has been studied by zoologist Bill Alther.† Suppose a small group of 19 Allen's hummingbirds has been under study in Arizona. The average weight for these...


Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† 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 previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with ? = 0.26 gram.

When finding an 80% confidence interval, what is the critical value for confidence level? (Give your answer to two decimal places.)

zc =


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


lower limit ____

upper limit ___

margin of error ___


b)What conditions are necessary for your calculations? (Select all that apply.)


A-uniform distribution of weights

B-? is known

C-normal distribution of weights

D-? is unknown


E-n is large

Find the sample size necessary for an 80% confidence level with a maximal margin of errorE = 0.06 for the mean weights of the hummingbirds. (Round up to the nearest whole number.)


 ____ hummingbirds







Jun 05, 2022
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