Identify the Variable of Interest in the Study

question 69

Multiple Choice

Identify the variable of interest in the study.
-The highway department paves one section of an Interstate with Type A concrete and an adjoining section with
Type B concrete and observes how long it takes until cracks appear in each.

• A)The difference between the measured length of time it takes for cracks to appear in each type of concrete
• B)Whether Type A concrete provides better traction than Type B concrete
• C)The difference between cost of the two types of concrete