Do you think that there is a relationship between women's heights and their weights? If you said yes, congratulations, you're right!
We can verify this assertion by using the data in R's built-in dataset,
women, which holds the height and weight of 15 American women from ages 30 to 39.
> head(women) height weight 1 58 115 2 59 117 3 60 120 4 61 123 5 62 126 6 63 129 > nrow(women)  15
Specifically, this relationship is referred to as a positive relationship, because as one of the variable increases, we expect an increase in the other variable.
The most typical visual representation of the relationship between two continuous variables is a scatterplot.
A scatterplot is displayed as a group of points ...