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 tail-feather length (measuring the R1 central tail feather) and weight in a sample of 20 male long-tailed finches raised in an aviary. The data are represented in the following scatterplot, along with the least-squares regression line equation and the square of the correlation coefficient (R²) .
What would be the predicted tail-feather length of a male long-tailed finch weighing 20 g?

A) 56.6 mm
B) 92.3 mm
C) 717.6 mm
D) Cannot be determined from the information given