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# Ecology: Hummingbirds Bill Alther is a zoologist who

ISBN: 9780618949922 213

## Solution for problem 11 Chapter 9.1

Understandable Statistics | 9th Edition

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Understandable Statistics | 9th Edition

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Problem 11

Ecology: Hummingbirds Bill Alther is a zoologist who studies Annas hummingbird (Calypte anna). (Reference: Hummingbirds, K. Long, W. Alther.) Suppose that in a remote part of the Grand Canyon, a random sample of six of these birds was caught, weighed, and released. The weights (in grams) were 3.7 2.9 3.8 4.2 4.8 3.1 The sample mean is Let x be a random variable representing weights of Annas hummingbirds in this part of the Grand Canyon. We assume that x has a normal distribution and It is known that for the population of all Annas hummingbirds, the mean weight is Do the data indicate that the mean weig

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Tuesday, February 28 th Chapter 8: Statistical Inference – Confidence Intervals • If I know the population parameters, I can predict the sample statistics • We only know what came out of the box from random sampling and want to make inferences about what’s in the box • One of these inferential procedures is confidence intervals • A reminder o Data are always an imperfect view of the population o What is see (in the data) is not quite the way it (the populatio

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Ecology: Hummingbirds Bill Alther is a zoologist who