Avoiding bias, increases reliability and is important to experimental data. A scientist is investigating the cause of an unusual color in the lake water of a specific location. Four residents of the location responded to questions asked by the scientist. The chart below shows their responses. Questions Resident 1's answer Resident 2's answer Resident 3's answer Resident 4's answer
Do you work at the coal mine near the lake? Yes No No Yes
Do you use the lake water for daily chores? Yes Yes No Yes
Is your family income affected by the presence of the coal mine near the lake? No Yes No Yes

Which resident's information is the least biased and the scientist most likely to get valid results?
Resident 1
Resident 2
Resident 3
Resident 4