decreased, whereas a positive number indicates 27. Global warming is causing many species living on mountain slopes to shift their elevational ranges upward. Is the vertical extent of their ranges (the difference between the upper limit and the lower limit of their elevational range) also changing as ranges shift upward? To examine this, Freeman et al. (2018) surveyed birds on the Cerro de Panti- acolla in Peru in 2017 and compared their findings to a previous survey of the same mountain in 1985. The following numbers are changes in the vertical range extent of 14 mid-elevation bird species, in meters. A negative number indicates that the vertical extent of the range of that species has increase; 0 indicates no 100, 380, –100, 0, –50, –50, –50, –150, 100, –50, –50, -200, 50, 100 a. Test the null hypothesis that the mean change the vertical extent of mountain birds is 0 meten (i.e., is neither increasing nor declining hu stable in the face of global warming). range b. What changes in the vertical extent of r are nevertheless consistent with the data? To answer, calculate the 95% confidence interval for the change in vertical range.

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question 27a

decreased, whereas a positive number indicates
27. Global warming is causing many species living on
mountain slopes to shift their elevational ranges
upward. Is the vertical extent of their ranges (the
difference between the upper limit and the lower
limit of their elevational range) also changing as
ranges shift upward? To examine this, Freeman
et al. (2018) surveyed birds on the Cerro de Panti-
acolla in Peru in 2017 and compared their findings
to a previous survey of the same mountain in 1985.
The following numbers are changes in the vertical
range extent of 14 mid-elevation bird species,
in meters. A negative number indicates that the
vertical extent of the range of that species has
increase; 0 indicates no
100, 380, –100, 0, –50, –50, –50, –150,
100, –50, –50, -200, 50, 100
a. Test the null hypothesis that the mean change
the vertical extent of mountain birds is 0 meten
(i.e., is neither increasing nor declining hu
stable in the face of global warming).
range
b. What changes in the vertical extent of r
are nevertheless consistent with the data? To
answer, calculate the 95% confidence interval
for the change in vertical range.
Transcribed Image Text:decreased, whereas a positive number indicates 27. Global warming is causing many species living on mountain slopes to shift their elevational ranges upward. Is the vertical extent of their ranges (the difference between the upper limit and the lower limit of their elevational range) also changing as ranges shift upward? To examine this, Freeman et al. (2018) surveyed birds on the Cerro de Panti- acolla in Peru in 2017 and compared their findings to a previous survey of the same mountain in 1985. The following numbers are changes in the vertical range extent of 14 mid-elevation bird species, in meters. A negative number indicates that the vertical extent of the range of that species has increase; 0 indicates no 100, 380, –100, 0, –50, –50, –50, –150, 100, –50, –50, -200, 50, 100 a. Test the null hypothesis that the mean change the vertical extent of mountain birds is 0 meten (i.e., is neither increasing nor declining hu stable in the face of global warming). range b. What changes in the vertical extent of r are nevertheless consistent with the data? To answer, calculate the 95% confidence interval for the change in vertical range.
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