Based on the following scenario, classify each of the following variables as a dependent, independent, or confounding variable.
A city water district hypothesizes that lead contamination in the drinking water in a neighborhood is the result of
degrading lead pipes between the city's water main and the tap in the house. They collect water samples from the
water treatment facility, the water main upstream of the neighborhood, and at the kitchen faucet of three houses in
the neighborhood. They then tested each of these samples for lead concentration. Detectable levels of lead were
found only in water taken from two of the kitchen taps, supporting the hypothesis that residential connections to the
water main are the source of contamination.
The location where water was collected

Determine the answer for each dependent, independent, or
confounding variable.

[Choose
The concentration of lead in the water sample
[Choose
Who collected the water sample
[Choose
The type of container used to collect and store
the water sample before testing
[Choose