Why are repeated trials important?

How can you identify the Independent (Manipulated) variable?

Why is it important to control your variables?

To test how different liquids affect plants, Bob sets up an experiment and uses all of the same species of plants, gives them all the same volume of liquid, and puts them in same environment. With this, what is Bob doing?

In an experiment using human subjects, why is it important to have lots of people in the study?

Mary wants to test how different fertilizers affect the volume of roots a rosebush grows. What is Mary's DV?

To represent the volume of roots in her rosebushes over two weeks, what is the best graph for Mary to use?

Bob is testing the effect of different liquids on plant growth. Which of the following would you expect to be a level of his independent variable?

What is the purpose of a control in an experiment?

Which data would be best represented with a bar graph?

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