Question 1093749
<pre>
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.
</pre>
a child’s age and a child’s shoe size is a positive correlation
<pre>
The bigger the child the bigger his foot and therefore his shoe size,

Both variables increase together, so that is a positive correlation.
</pre>
the cost to mail an envelope and the weight of the envelope is a 
positive correlation
<pre>
The heavier the package, the costlier it is to mail it.

Both variables increase together, so that is a positive correlation. 
</pre>
none, since all of the other answer choices are true
<pre>
We must check out the last one to see whether this one is true or 
false.
</pre>
the graduation rate in a city and the rate of unemployment in a city 
is a positive correlation 
<pre>
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</pre>