If psychologists decide to use a correlation scattergraph to measure their results then both their IV and DV can be measured numericaly such as the longer you spend in day care the more aggresive you are. This shows the relationship between the two varibles and can easily be compared. You can analyse the data by comparing the strength of the results. Such as if there is a strong, positive relationship the you can say the correlational co-efficient is 0.9 or if it is a stong negative relationship then the correlational co-efficient would be -0.9. If there is no relationship the it would be 0.
A negative of using a scattergraph is that there may be extrainious or a 3rd varible affecting results such as the attachment type of the child in how aggresive they are in daycare.
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