You just need to know the difference between a positive and a
negative correlation between two variables.
If both variables increase or decrease together, there is a
positive correlation.
If one variable increases while the other decreases, there is
a negative correlation.
a child’s age and a child’s shoe size is a positive correlation
The bigger the child the bigger his foot and therefore his shoe size,
Both variables increase together, so that is a positive correlation.
the cost to mail an envelope and the weight of the envelope is a
positive correlation
The heavier the package, the costlier it is to mail it.
Both variables increase together, so that is a positive correlation.
none, since all of the other answer choices are true
We must check out the last one to see whether this one is true or
false.
the graduation rate in a city and the rate of unemployment in a city
is a positive correlation
Certainly this is not a positive correlation, for when more people graduate,
unemployment certainly doesn't rise. Employment may rise but certainly not
unemployment. So that one is false.
Edwin
