The Results of a Correlational Study Indicate That First-Born Children

Multiple Choice

The results of a correlational study indicate that first-born children make higher grades than second-born children. One can conclude that:

A) all first-born children make higher grades than second-born children.
B) more first-born children make higher grades than second-born children.
C) less than half of first-born children make higher grades than second-born children.
D) no conclusions can be drawn from correlational studies.