Answer:
the null hypothesis is: The proportion of U.S. adults age 25 or older who smoke is 0.22
Explanation:
A null hypothesis is presumed to be true until evidence proves the contrary. Statistical data nullifies it for an alternative hypothesis.
In this case, the null hypothesis is: The proportion of U.S. adults age 25 or older who smoke is 0.22
The hypothesis that has to prove it is different is: the proportion of U.S. adults age 25 or older who smoke is lower than 0.22
