# Independent vs Dependent Variable

When evaluating research summaries, we should be taking special care and identify the variables in our experiments.

Now, the variables in basic experiments may be either dependent or independent.

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Question 1 of 2

A tall man feeds his cows different amounts of food each day. He notices that the cows are happier on days when they receive the most food. In this situation, what is the independent variable?

A.
B.
C.
D.

Question 1 of 2

Question 2 of 2

A control variable

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B.
C.
D.

Question 2 of 2

The transcript is for your convenience.
We start here with the independent variable. Independent variables in experiments are the aspects of an experiment that are changed, on purpose, by the scientists.

Then there are also dependent variables. Dependent variables in experiments are those aspects that are responding to the changes made by the scientists in independent variables. Here, it has to do with cause and effect.

Independent variable cause dependent variables to change. So independent variables are on purpose manipulated by the scientists so that they can see what the effects are on dependent variables. While independent variables are manipulated, dependent variables are just observed by scientists to observe changes that have taken place in them.

It is very important that we can identify the dependent and independent variables in experiments. Let’s look at an example. In an experiment, scientists want to explore how plastic is reacting to different levels or amounts of heat. So here we’ll be looking at plastic and how it responds to heat.

Here, the independent variable is the temperature since here, we look at cause and effect and we look at how the plastic will be responding to heat. Here, the temperature is the independent variable since that’s exactly what we’ll be changing around to find out how the plastic responds.

That’s leading us to our dependent variable. This will be the plastic since we’re observing how this plastic will react to the different levels or amounts of heat.

Once again, independent variables are aspects of an experiment that are changed. Dependent variables are those aspects that are responding to the changes that we’ve made in independent variables.

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