Allen's hummingbird ( Selasphorus sasin ) has been studied by zoologist Bill Alther.† Suppose a small group of 13 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 13 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 ? = 0.20 gram.




(d)


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

____________ hummingbirds




Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.t Suppose a small group of 13 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous<br>studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with o = 0.20 gram.<br>(a) Find an 80%e confidence interval for the average weights of Allen's bummingbirds in the study region What is the margin of error? (Round vour answers to two decimal places )<br>

Extracted text: Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.t Suppose a small group of 13 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 o = 0.20 gram. (a) Find an 80%e confidence interval for the average weights of Allen's bummingbirds in the study region What is the margin of error? (Round vour answers to two decimal places )

Jun 03, 2022
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