by their increase or decrease
A diagram that exhibits a relationship, often functional, between two sets of numbers as a set of points having coordinates determined by the relationship.
The answer depends on what sort of variables the data are (qualitative, quantitative-discrete, quantitative-continuous are; the nature of the relationship (if any) between the data sets; how much information you wish the graph to convey and how much you would prefer to describe in the accompanying text.
A pattern formed by 2 sets of numbers.
A Venn Diagram
The natural numbers (or counting numbers) usually denoted by Z.
10
There are 167 numbers between 10 and 178. There are, therefore 2167 = 1.87*1050 sets.
Venn diagrams are a means for displaying relationships between sets.
There is no correlation.
Correlation
A mapping is a relationship between two sets.
Regression.