I want to explore the relationship between a person's brain size
and his or her exam score.
The exam score (x) is an integar from 0 to 100.
but the brain size (y) is numeric from 0 to 20.0.
Is the exam score discrete or continuous?
If we use lm(y~x), does it mean we treat the exam score as a continuous
variable?
what is the difference between a factor and a discrete data variable?