The number of infant mortalities as a function of the baby's birthweight (in grams) for 72,730 live white births in New York in 1974 is as follows:
Outcome at the End of 1 Year
|
Birthweight
|
Alive
|
Dead
|
|
Less than 2,500
|
4,597
|
618
|
|
Greater than 2,500
|
67,093
|
422
|
Test the hypothesis that the birthweight is independent of whether or not the baby survives its first year.