If the answer you are expecting is correlation, then you are wrong. Correlation refers only to linear relationship between two variables.
The correlation for any even relationship over a symmetric domain will be 0. Thus, if y = x2 between the values -a < x < a (for some a), the correlation between y and x will be 0 but few would contend that there is no relationship between the two.
There is an inverse relationship between the datasets.
Regression.
There is no correlation.
bar graph
to show the relationship between 2 sets of data
It is a positive relationship.
Comparing the relationship of two data sets is needed to see which of the two sets have more life distribution. Two data sets involve the use of simple plotting and contour plots.
There is an inverse relationship between the datasets.
Correlation.
Regression.
There is no correlation.
Correlation
A measure of association. You might be thinking of the correlation coefficient in particular.
bar graph
to show the relationship between 2 sets of data
Correlation
a bar graph