Dr. kid is studying the effects of sleep on a child's reading speed. she initially takes a measure of each child's reading speed. next, she varies the amount of sleep different children get. finally, she re-measures their reading speed. what is the independent variable in her study?

Sleep time.

Explanation:

Independent variables are usually time or age. Usually the dependent variable is that variable that is being measure. In this example, the child's reading speed. The dependent variables is attached or "depends" on the amount of time a child needs to sleep.

answer; /// i believe that the correct answer is that it lets you see and evaluate different formats as you develop your workbook;

in about winter like late november to january