What is an independant variable?

• a variable that stays the same in an experiment

• the result of an experiment

• a variable that is changed by the scientist

• a variable that changes because of the experiment

What is the control group in an experiment?

• a variable that changes due to the independent variable

• a variable that does not change during an experiment

• a single variable that is changed

• the result of the experiment

What is the dependent variable?

• a variable that the scientist changes

• a variable that does not change during an experiment

• the result of the experiment

• a variable that never changes

Why are control groups important in an experiment? Check ALL that apply.

• allow for VALID results

• allow for FAIR results

• allow for CORRECT results

• allow for COMPARISON

Students of different ages were given the same puzzle to put together. They were timed to see how long it took to finish the puzzle. What is the IV?

• Student ages

• The puzzle

• The time it takes to complete

• None of the above

Students of different ages were given the same puzzle to put together. They were timed to see how long it took to finish the puzzle. What is the DV?

• Student ages

• The puzzle

• Time to finish the puzzle

• None of the above

Students of different ages were given the same puzzle to put together. They were timed to see how long it took to finish the puzzle. What is the control?

• Student ages

• The puzzle

• Time it takes to finish the puzzle

• None of the above

• Hours is the dependent variable

• Number of E. Coli Bacteria is the dependent variable

• Hours is the independent variable

• Number of E. Coli Bacteria is the independent variable

What is this graph missing? Check all that apply.

• A title

• Data points

• X axis label

• Y axis label

• Units