Many people don't answer unknown numbers. Of those that do, many will hang up if it's a telemarketer or pollster. Some remaining percentage will do a poll. So,

Many people don't answer unknown numbers. Of those that do, many will hang up if it's a telemarketer or pollster. Some remaining percentage will do a poll. So, we've selected for those kind of people. Also, people with a phone. Additionally, it being 3,000 people means you've proven something about 3,000 people in that category. So, all I'd report is that 3,000 people who are willing to do phone polls are experiencing these things. Who knows about Americans in general.