Matt’s experiment was designed to find out if reading an entire chapter at once led to better test grades than reading a section at a time over several days. The dependent variable in his experimental research was .

a) the test grade
b) the length of the chapter
c) reading an entire chapter
d) reading a section at a time

The answer to this question is (a) The test grade

Step-by-step explanation:

A variable is an object, event or idea that is been measure in a particular research. There are basically two types of variable that a research entails.  

(1) independent variable  (2) dependent variable

An independent variable is variable that stands alone and that doesn't change as a result of other variable. On the other hand, a dependent variable changes as a result of other factors (i.e) it depends on other factors.

In relation to the question above, the dependent variable in Matt's experiment is the test grade because it changes as a result of the reading method selected

  Hence the answer is (a) The test grade

the radius is 2 times the diameter.

step-by-step explanation: