Design a Fair Test micro-lesson
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An important part of the scientific process is to design a fair test. This means considering what you are changing, your independent variable, and what you will measure, your dependent variable, and controlling for all other variables. When we control for variables, we keep them the same. You can think of this like two people having a race. If one person won the race, you might think that they are faster, but you cannot be sure this is true if one person had their shoelaces tied together and the other did not. This would not be a fair test. So, for example, if I'm trying to find out if playing music to plants makes them grow faster, I would measure the growth for plants growing with and without music, but I would need to make sure all other variables were the same such as the amount of seeds I planted, how much I watered the plants, where I kept the plants, and so on.
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A fair test would be...1) an experiment which had good controls.2) a race where someone had their shoelaces tied together.3) all races are fair tests.4) any experiment.
What are controls?1) Variables you must keep the same.2) All variables.3) The variable you will measure.4) The variables you will change.
What is a dependent variable?1) The variable you will measure.2) Variables you must keep the same.3) All variables are dependent variables.4) There is no such thing as a dependent variable.
What is an independent variable?1) The variable you change.2) Variables you must keep the same.3) All variables are independent variables.4) There is no such thing as an independent variable.
Which of these might be a control for an experiment on plant growth?1) The amount you water the plants.2) Measuring how much the plant grows.3) There would be no controls4) The independent variable would be a control.
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