inches in height (measured on the horizontal axis) is typically 19 pounds in weight (measured on the vertical axis).

These data apply only to children in the first three years of life.

Boys from Birth to 36 Months

Girls from Birth to 36 Months

Length (inches) Weight (pounds)

Length (inches) Weight (pounds)

20.0

22.0

24.0

26.0

28.0

30.0

32.0

34.0

36.0

38.0

8.0

10.5

13.5

16.4

19.0

21.8

24.3

27.0

29.3

32.0

20.0

22.0

24.0

26.0

28.0

30.0

32.0

34.0

36.0

38.0

7.9

10.5

13.2

16.0

18.8

21.2

24.0

26.2

28.9

31.3

TABLE A2 Length to Weight Relationship for American Boys and Girls

Not all relationships in economics are linear. Sometimes they are curves. Figure A4 presents another example

of a line graph, representing the data from Table A3. In this case, the line graph shows how thin the air

becomes when you climb a mountain. The horizontal axis of the figure shows altitude, measured in meters
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