Energy spent on reproduction constitutes an organism’s “reproductive effort”. Th
ID: 49801 • Letter: E
Question
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:
5. What is the null hypothesis associated with this type of statistical analysis?
A) means of x and y are equal
B) variances of x and y are equal
C) no association between x and y
D) slope of line y = bx + a is zero
6. Given the reported statistical results, would the null hypothesis/hypotheses be rejected with an ? = 0.05?
A) yes
B) yes for cone number, but not for ring width
C) yes for ring width, but not for cone number
D) no
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
D) slope of line y = bx + a is zero
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