Q: I n chapter 17, we used confidence intervals to compare the
I n chapter 17, we used confidence intervals to compare the biomasses of two populations of the diatom-feeding caddisfly, Neothremma alicia. That comparison indicated that the population living in a...
See AnswerQ: In chapter 18 (p. 406) we compared samples from
In chapter 18 (p. 406) we compared samples from two populations using the t- test to judge whether there was a statistically significant difference between the populations. While the t -test is one of...
See AnswerQ: The question we consider now is how to represent variation in samples
The question we consider now is how to represent variation in samples drawn from populations in which measurements or observations do not have normal distributions. When analyzing normally distributed...
See AnswerQ: Suppose you are studying the exchange of organic matter between forests and
Suppose you are studying the exchange of organic matter between forests and streams and the landscape you are studying is a mosaic of patches of two forest types: deciduous and coniferous. Part of you...
See AnswerQ: In chapter 6 (see p. 136) we considered the
In chapter 6 (see p. 136) we considered the number of samples necessary to obtain a reasonably precise estimate of the number of species in two simple communities. In chapter 16 (see p. 359) we recons...
See AnswerQ: In chapter 2 (p. 18) we determined the sample
In chapter 2 (p. 18) we determined the sample mean. However, while the sample mean is one of the most common and useful of summary statistics, it is not the most appropriate statistic for some situati...
See AnswerQ: One of the most common and important steps in the processing of
One of the most common and important steps in the processing of data is the production of summary statistics. First, what is a statistic? A statistic is a number that is used by scientists to estimate...
See AnswerQ: Ecologists explore the relationships between organisms and environment using the methods of
Ecologists explore the relationships between organisms and environment using the methods of science. The series of boxes called “Investigating the Evidence†that ar...
See AnswerQ: What kinds of animals would you expect to have type 1,
What kinds of animals would you expect to have type 1, 2, or 3 functional responses? How should natural selection for better prey defense affect the height of functional response curves? How should na...
See AnswerQ: The rivers of central Portugal have been invaded, and densely populated
The rivers of central Portugal have been invaded, and densely populated by the Louisiana crayfish Procambarus clarki, which looks like a freshwater lobster about 12 to 14 cm long. The otters of these...
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