1. y Graph y = x
x

2. Correlation Coefficient
Years of education VS Income

4. Positive correlation
­ one variable increases as the other variable
increases.
­ or one variable decreases as the other decreases
­ the r value falls between 0 and +1
­ stronger correlation is indicated by a value
closer to +1

5. Grade point average VS time spent watching
TV

7. Negative Correlation
­ as one variable increases, another variable
decreases
­ the r value used falls between 0 and ­1
­ stronger correlation is indicated by a value close
to ­1
­ weaker correlation is indicated by a value close
to 0

9. Zero Correlation
­ the variables in question essentially have
nothing to do with each other.
­ there is really no relationship between the
variables.
­ the r value would be very close to or equal to 0

10. Assignment #4
Page V­F­29
Questions 1 ­ 4