Question

1. which of the following describes a potential source of bias in an experiment? a) a scientist measuring plant height records taller measurements because they expect fertilizer to work b) plants are randomly assigned to treatment groups c) all plants are given the same amount of water d) a control group is used for comparison 4. what is the purpose of a control group in an experiment?

Explanation:

A control group in an experiment serves as a baseline for comparison. It is not given the treatment (like the fertilizer in this plant - related experiment) that the experimental group receives, allowing researchers to determine the effect of the treatment by comparing the results between the two groups.

Answer:

1. d) A control group is used for comparison