Allen's hummingbird has been studied by zoologist bill Alther. Suppose a small group of 15 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= 0.26 gram. 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 answer to two decimal places) lower limit? Upper limit? Margin of error? b. What conditions are necessary for your calculations? c. Find the sample size necessary for an 80% confidence level with a maximum margin of error E=0.09 for the mean weights of the hummingbirds. (Round your answer to the nearest whole number)
Allen's hummingbird has been studied by zoologist bill Alther. Suppose a small group of 15 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
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 answer to two decimal places) lower limit? Upper limit? Margin of error?
b. What conditions are necessary for your calculations?
c. Find the
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