You want to know whether the residents of your town recycle. You survey every house on the west side of town. Is this survey biased or unbiased? 1. Unbiased because the sample only included the residents in one area.

2. Biased because the sample included all the residents in the area.

3. Biased because the sample only included the residents in one area.

4. Unbiased because the sample included all the residents in the area.