Question

2
select all the correct answers.
hakeem is testing the effects of sunlight on samples of soil. which of these actions would introduce confounding variables into hakeems
experiment?
□ he tests a theory thats already been established.
□ he tests multiple hypotheses at a time.
□ he uses identical specimens when completing multiple trials.
□ he adjusts the independent variable and records the effects.
□ he uses different types of soil in each of his samples.

Explanation:

• Testing multiple hypotheses at a time can make it difficult to determine which hypothesis is affecting the results, introducing confounding variables.
• Using different types of soil in each sample means there is an additional variable (soil type) besides sunlight that can impact the outcome, thus introducing a confounding variable.
• Testing an established theory does not introduce a confounding variable.
• Using identical specimens for multiple trials helps control variables, not introduce confounding ones.
• Adjusting the independent variable (sunlight, which is the variable of interest in the experiment about sunlight's effects) and recording effects is a normal part of the experiment and does not introduce a confounding variable.

Answer:

• He tests multiple hypotheses at a time.
• He uses different types of soil in each of his samples.