2. Energy spent on reproduction constitutes an organism’s “reproductive effort”.
ID: 49794 • Letter: 2
Question
2. Energy spent on reproduction constitutes an organism’s “reproductive effort”. The figure below shows the relationship between reproductive effort (number of cones produced) and annual growth (as measured by radial growth) for the Douglas fir, Pseudotsuga menzieii. The line represents the general trend as defined by least-squares linear regression: y = -1.70x + 107.5 (n = 32; r2 = 0.71; p= 0.008). Answer the following questions:
1. What is/are the independent variable(s)?
A) number of annual rings
B) number of cones
C) both A and B
D) width of rings
2. What is/are the dependent variable(s)?
A) number of annual rings
B) number of cones
C) both A and B
D) width of rings
3. What is the most precise description of the relationship between reproductive effort and annual growth for the Douglas fir?
A) positive
B) negative
C) y = -1.70x + 107.5
D) there is no apparent relationship
4. What is this type of statistical analysis called?
A) correlation
B) regression
C) t-test
D) ANOVA
120 115 110 105 t00 35 90 85 80 75 02 46 8 10 12 14 16 20 22 Mean number of cones per tree (x 1p:)Explanation / Answer
1.Both A and B is thr right answer because these two variable are subjected on x axis and y axis for a regression analysis. So we must be regressing one variable over the other to find the correlation between them.
2.number of cones is the dependent variable . Because we are regressing the independent variable i.e number of rings to number of cones.
3. As evident from the equation that the slope that the value is negative i.e -1.70 so the relation between them is negative
4.regression analysis. Because in this analysis we are trying to take independent variable to dependent variable. You can see in the second image there is a graph that clarifies that it is a regression analysis. The dots are the values of the variable and line shows the point to which these values must be regressed.
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