Select all statements that are true about a linear relationship between a response variable and an explanatory variable .
The value of represents the slope of the least-squares regression line.
The relationship can be expressed mathematically in the form =+ where and are constants.
The residual plot based upon the least-squares regression line shows a U-shaped leftover pattern.
The scatter plot looks like a straight line.
The -intercept is the value of when =0 .