Answer: Null hypothesis :

Alternative hypothesis :

Explanation:
Given claim : The proportion of U.S. adults age 25 or older who smoke :

A researcher suspects that the rate is lower among U.S. adults 25 or older who have a bachelor's degree. i.e.

Since the null hypothesis is a fact checked by the researcher or the experimenter that always contains a equals to sign.
∴ Null hypothesis :

Alternative hypothesis :
