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 is the value of the correlation coefficient describing the relationship between weight and tail-feather length?

A) Approximately 0.05
B) Approximately 0.21
C) Approximately 0.46
D) Cannot be estimated from the information provided