Question

caroline conducted an investigation to test the effectiveness of water filters. she poured water from the tap through three different water filters. she wanted to see which water filter was able to remove the most chlorine. which would be her control in the experiment? the unfiltered tap water the filtered water the filtered water the amount of chlorine removed

Explanation:

To solve this, we analyze the experiment setup:

Step 1: Understand the experiment

Caroline is testing water filters' effectiveness. She pours tap water through filters and wants to see which removes the most debris. A control group is used to compare results. The control should be a sample that doesn't go through the filter (to see the original debris in tap water).

Step 2: Evaluate options

• The unfiltered tap water: This is the control because it represents the water before filtration. We can compare the filtered water samples to this to see how much debris each filter removes.
• The filtered water: This is the result of the experiment, not the control.
• The filtered water (repeated): Also a result, not a control.
• The amount of a filter removed: This is a measurement of the filter's performance, not a control group.

Answer:

The unfiltered tap water