(e) Approximately what mean temperature would result in a prediction of the same number of salamander larvae moving upstream and downstream? (Round your answer to two decimal places.) 14.51 X °C

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The authors of the paper "Evaluating Existing Movement Hypotheses in Linear Systems Using Larval Stream Salamanders"+
investigated whether water temperature was related to how far a salamander would swim and whether it would swim upstream or
downstream. Data for 14 streams with different mean water temperatures where salamander larvae were released are given
(approximated from a graph that appeared in the paper).
The two variables of interest are x = mean water temperature (°C) and y = net directionality, which was defined as the difference
in the relative frequency of the released salamander larvae moving upstream and the relative frequency of released salamander
larvae moving downstream. A positive value of net directionality means a higher proportion were moving upstream than
downstream. A negative value of net directionality means a higher proportion were moving downstream than upstream.
Mean Temperature (x) Net Directionality (y)
6.17
-0.08
8.06
0.25
8.62
-0.14
10.56
0.00
12.45
0.08
11.99
0.03
12.50
-0.07
17.98
0.29
18.29
0.23
19.89
0.24
20.25
0.19
19.07
0.14
17.73
0.05
19.62
0.07
Transcribed Image Text:The authors of the paper "Evaluating Existing Movement Hypotheses in Linear Systems Using Larval Stream Salamanders"+ investigated whether water temperature was related to how far a salamander would swim and whether it would swim upstream or downstream. Data for 14 streams with different mean water temperatures where salamander larvae were released are given (approximated from a graph that appeared in the paper). The two variables of interest are x = mean water temperature (°C) and y = net directionality, which was defined as the difference in the relative frequency of the released salamander larvae moving upstream and the relative frequency of released salamander larvae moving downstream. A positive value of net directionality means a higher proportion were moving upstream than downstream. A negative value of net directionality means a higher proportion were moving downstream than upstream. Mean Temperature (x) Net Directionality (y) 6.17 -0.08 8.06 0.25 8.62 -0.14 10.56 0.00 12.45 0.08 11.99 0.03 12.50 -0.07 17.98 0.29 18.29 0.23 19.89 0.24 20.25 0.19 19.07 0.14 17.73 0.05 19.62 0.07
(e) Approximately what mean temperature would result in a prediction of the same number of salamander larvae moving
upstream and downstream? (Round your answer to two decimal places.)
14.51
X °C
Transcribed Image Text:(e) Approximately what mean temperature would result in a prediction of the same number of salamander larvae moving upstream and downstream? (Round your answer to two decimal places.) 14.51 X °C
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