Incentives for Quitting Smoking: Group or Individual?

In a smoking cessation program, over $2000$ smokers who were trying to quit were randomly assigned to either a group program or an individual program. After six months in the program, $148$ of the $1080$ in the group program were successfully abstaining from smoking, while $120$ of the $990$ in the individual program were successful. ${?}^1$ We wish to test to see if this data provide evidence of a difference in the proportion able to quit smoking between smokers in a group program and smokers in an individual program.

Let group $1$ be the smokers trying to quit smoking who are in a group program and let group $2$ be the smokers trying to quit smoking who are in an individual program.