Carole Grand and Bonnie Lamore run a shuttle service from Western Illinois to the busy Chicago O'Hare airport. Last month, they recorded the following: 
Carole and Bonnie's gross profit for the past month was:
Definitions:
Independent Variable
In experimental research, the variable that is manipulated or changed to observe its effects on the dependent variable.
Dependent Variable
The outcome the researcher is interested in measuring.
Confounding Variable
An outside influence that changes the effect of a dependent and independent variable being examined in an experimental study, potentially skewing results.
Problems
Issues, obstacles, or challenges that need to be dealt with or overcome.
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