Name:______Date:______Period/#:_____
Practice Writing a Hypothesis Statement and
Identifying Variables
Directions: Identify the independent & dependent variable in each experiment. Pay attention to the bold words to help you. Then, write a hypothesis. Read your hints before you start!
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HINT: Independent Variable (IV) = What the Scientist CHANGES or TESTS
HINT: Dependent Variable (DV) = What the Scientist MEASURES
HINT: Writing a Hypothesis
IF (Independent Variable (IV)) THEN (Dependent Variable …increase/decrease)__ BECAUSE (provide a scientific reason ….NOT circular logic!)
NOTE: Use third person present tense. Ex: If baking soda and vinegar are added to the water, then the raisins will dance because the CO2 released will buoy the raisins to the surface when they attach to the wrinkled skin.
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1. Toyota wants to find out which model car produces the least amount of pollution. The company tests three different models: a Base Model, Mid-sized model, and Luxury model. Then, the scientist records the amount of pollution released into the air.
Ø IV: ______
Ø DV: ______
Ø Hypothesis:______
2. A potato chip company is launching a new flavor called “Zesty Taco”. The company thinks that the color of the packaging might affect how many bags are sold. Therefore, the company sends out chips packaged in three different colored bags: Red, Yellow, and Blue. After one year, they record the number of bags sold for each color.
Ø IV: ______
Ø DV: ______
Ø Hypothesis:______
3. John loves to microwave popcorn but hates when there are kernels left in the bag. He sets up an experiment to find out the perfect popping time. He pops each bag for a different amount of time: 2 minutes, 3 minutes, OR 4 minutes. For each bag he records the number of kernels left in the bag.
Ø IV: ______
Ø DV: ______
Ø Control: ______Hint: What variables remains constant?
Ø Hypothesis:______