Final answer:
If Sy/x = 0.00, it means that there is no relationship between the variables x and y, so the relationship can be considered as perfect.
Step-by-step explanation:
A slope of zero means that there is no relationship between x and y. Graphically, the line is flat; that is, zero rise over the run. Figure A5 of the unemployment rate, shown later in this appendix, illustrates a common pattern of many line graphs: some segments where the slope is positive, other segments where the slope is negative, and still other segments where the slope is close to zero.
In this case, if Sy/x = 0.00, it means that there is no relationship between the variables x and y. The relationship can be considered as perfect, because there is no error or deviation from the line.