Tail-Feather Length in Birds Is Sometimes a Sexually Dimorphic Trait

Multiple Choice

Tail-feather length in birds is sometimes a sexually dimorphic trait. That is, the trait differs substantially for males and for females. Researchers studied the relationship between weight (x) and tail-feather length (y) in a sample of five wild, male long-tailed finches. Here are the data and software output:
$$\begin{array} { c c } \text { weight } ( \mathrm { g } ) & \text { tail length } ( \mathrm { mm } ) \\20.8 & 82.5 \\19.1 & 82.5 \\15.9 & 67.0 \\16.7 & 70.5 \\15.7 & 73.5\end{array}$$ Simple linear regression results:
Dependent Variable: tail length
Independent Variable: weight
tail length $= 25.547393 + 2.8147736$ weight
Sample size: 5
$R$ (correlation coefficient $) = 0.88813734$
$\mathrm { R } - \mathrm { sq } = 0.78878793$
Estimate of error standard deviation: $3.7411656$

Parameter estimates:

$\begin{array}{|l|c|c|r|r|r|r|}\hline \text { Parameter } & \text { Estimate } & \text { Std. Err. } & \text { Alternative } & \text { DF } & \text { T-Stat } & \text { P-value } \\\hline \text { Intercept } & 25.547393 & 14.928136 & \neq 0 & 3 & 1.7113585 & 0.1855 \\\hline \text { Slope } & 2.8147736 & 0.84093435 & \neq 0 & 3 & 3.3471979 & 0.0442 \\\hline\end{array}$ What is the value of the y intercept for the least-squares regression line based on these data?

A) 25.547 mm
B) 25.547 mm/g
C) 2.815 g/mm
D) 2.815 mm/g