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 and 21 female long-tailed finches raised in an aviary.
We would like to use the observed least-squares regression line between weight and tail-feather length of females to predict the tail-feather length of a male long-tailed finch weighing 8 g. Would this prediction be appropriate?

Question

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 and 21 female long-tailed finches raised in an aviary.
 We would like to use the observed least-squares regression line between weight and tail-feather length of females to predict the tail-feather length of a male long-tailed finch weighing 8 g. Would this prediction be appropriate?

Quizplus · Accepted Answer

The Answer of 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 and 21 female long-tailed finches raised in an aviary.
 We would like to use the observed least-squares regression line between weight and tail-feather length of females to predict the tail-feather length of a male long-tailed finch weighing 8 g. Would this prediction be appropriate?

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