Question

When setting up the above experiment, the scientist has the option of using a separate water filter for each of the three tanks or using a single filtration system that attaches all three and affects them simultaneously. Which of the following filter set ups makes a more valid experiment and why?

A) separate filters for each of the three tanks, because this ensures a higher quality of water for each tank

B) one filtration system for all three tanks, because this makes filtration a controlled variable

C) one filtration system for all three tanks, because this reduces the workload for the researcher

D) separate filters for each of the three tanks, because this adds another variable to be tested and analyzed for inclusion in the experiment's results

Answer 1

The more valid setup for the experiment is to use separate filters for each tank, as it eliminates confounding variables and allows for the analysis of each tank individually. Thus, the option D is the correct answer.

Step-by-step explanation:

In this experiment, the scientist is testing the effect of water filtration on the tanks. The more valid setup would be to use a separate filter for each of the three tanks (Option D).

By using separate filters, the scientist can ensure that each tank is receiving a specific level of filtration, which can be compared and analyzed separately. This helps eliminate any confounding variables that may arise from using a single filtration system that affects all three tanks simultaneously.

Using a single filtration system (Option B) may introduce more variability and make it difficult to determine the specific effect of filtration on each tank. Option A is also not a valid choice, as it does not address the need for controlled conditions in the experiment.