I need help understanding this

Question

A poll of 902 adults in the United States found that 54% support some form of universal health care with a margin of error of 2%. Can we be certain that a majority of adults in the United States support some form of universal health care

Answer 1

No this is a very small sample that cannot represent the voting adults in the U.S.

There are about 152,000,000 registered voters in the U.S. in the last election time frame,

and 902 could not represent this many registered voters.