Chicago Ltd is a large retailer of hardware equipment that sells its products through a network of suburban stores. Shown below are the calculation of some of its key ratios for 2019 and 2018. 
Which of the above ratios explains why ROA has decreased from 2018 to 2019?
Definitions:
Curvilinear Relationship
A type of relationship between two variables where the change in the outcome variable does not happen in a straight-line manner with changes in the predictor variable.
Factorial Designs
Experimental setups that allow researchers to examine the effects of two or more independent variables on a dependent variable simultaneously.
Independent Variable
The variable that is manipulated in an experiment to see its effect on a dependent variable.
Interactions
In research, refers to the way that different factors or variables influence each other, often changing the outcome or effects when combined.
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