5.1 #9a. Two hundred samples of water taken from many sites all along the Charles River show unsafe concentrations of toxic chemicals. Obviously the water in the Charles River is unsafe. Question 9 options: target group: concentrations of toxic chemicals; sample: two hundred samples of water taken from many sites all along the Charles River; relevant property: water in the Charles River target group: water in the Charles River; sample: concentrations of toxic chemicals; relevant property: two hundred samples of water taken from many sites all along the Charles River target group: two hundred samples of water taken from many sites all along the Charles River; sample: water in the Charles River; relevant property: concentrations of toxic chemicals target group: water in the Charles River; sample: two hundred samples of water taken from many sites all along the Charles River; relevant property: concentrations of toxic chemicals