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 5 wild male long-tailed finches. Here are the data:
$$\begin{array} { c c } \text { weight } ( \mathrm { g } ) & \text { tail length } ( \mathrm { mm } ) \\20.8 & 82.5 \\19.1 & 82.5 \\15.9 & 67.0 \\16.7 & 70.5 \\15.7 & 73.5\end{array}$$ Using appropriate software, what is the numerical value of the y intercept for the least-squares regression line?

A) 0.280
B) 2.815
C) 3.741
D) 25.547