Question

Sally's librarian told her that she could increase the size of her vocabulary by spending more time reading. Based on this information, which statement below best describes the size of Sally's vocabulary?
A) The size of Sally's vocabulary is neither an independent nor dependent variable.
B) The size of Sally's vocabulary is both an independent and a dependent variable.
C) The size of Sally's vocabulary is a dependent variable.
D) The size of Sally's vocabulary is an independent variable.

Answer 1

The answer is C) The size of Sally's vocabulary is a dependent variable. 

Sally's vocabulary size is based on how much she reads. Which makes it dependent on how much she reads.

The independent variable would be her reading, it is not dependent on any other variable.