The following graph is used to evaluate an assumption of a multiple regression analysis. What is the assumption? 
Definitions:
Inferential Statistics
A branch of statistics that infers properties of an underlying distribution from a sample, allowing for predictions and conclusions about a population.
Correlation
A statistical procedure for measuring the strength of association between two or more variables. More generally, the degree to which variables are related.
Correlation
A statistical measure that indicates the extent to which two or more variables fluctuate together.
Type II Error
The mistake of not rejecting a false null hypothesis, also known as a "false negative" in statistical hypothesis testing.
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