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Plant Growth Experiment

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Katherine wants to investigate if the time of day a plant is watered affects the growth of the plant. She hypothesizes that a plant watered in the morning will grow faster than a plant watered at other times of the day.

Identify the specific independent and dependent variables that will be involved in an experiment to test this hypothesis.
List at least five variables that should be controlled during the experiment. For each variable identified, give a specific suggestion for how it can be controlled during the experiment.
use the terms:

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Solution Preview

The dependent variable is the event studied. The dependent variable changes as Katherine modifies the independent variable.

Katherine is studying the growth of the plant, which is the dependent variable. the independent variable that Katherine modifies is the time at which she waters the plant.

The question asks you to list five variables that should be controlled during an experiment. You should start your answer by saying why variables need to be controlled. For example:

Variables in an experiment need to be controlled so that you are investigating only the effects of the independent variable on the dependent variable. By eliminating sources of uncontrolled variability, the researcher is able to focus on the results ...

Solution Summary

The question asks you to setup an experiment investigating plant growth in response to differences in watering. The question is concerned with dependent and independent variables. The answer defines these terms and helps the student come up with an experiment that controls other variables that could prevent or hinder the researcher from drawing a proper conclusion