Experimental Design Worksheet



Experimental Design Worksheet Name ______________________________

Scientific Method Period ___________ Date______________

Definitions: Define the following words and concepts related to the scientific method.

1. Hypothesis: _____________________________________________________________________________

2. Independent Variable: _____________________________________________________________________

3. Dependent Variable: ______________________________________________________________________

4. Control Group: ___________________________________________________________________________

5. Experimental Groups: _____________________________________________________________________

6. Controlled Variables (Constants): ____________________________________________________________

7. Trials: __________________________________________________________________________________

Practice: Write a hypothesis for each of the statements and identify the variables, control group, and experimental group.

1. Cigarette smoking increases the risk of lung cancer.

Hypothesis: If _______________________________, then _________________________________________

Independent Variable: ___________________________ Dependent Variable: ________________________

Control Group: ________________________________ Experimental Group: ________________________

2. Eating breakfast increases performance in school.

Hypothesis: If _______________________________, then _________________________________________

Independent Variable: ___________________________ Dependent Variable: ________________________

Control Group: ________________________________ Experimental Group: ________________________

3. Hummingbirds are attracted to the color red.

Hypothesis: If _______________________________, then _________________________________________

Independent Variable: ___________________________ Dependent Variable: ________________________

Control Group: ________________________________ Experimental Group: ________________________

4. Bats locate food using sound waves.

Hypothesis: If _______________________________, then _________________________________________

Independent Variable: ___________________________ Dependent Variable: ________________________

Control Group: ________________________________ Experimental Group: ________________________

5. iBook batteries last for 5 hours.

Hypothesis: If _______________________________, then _________________________________________

Independent Variable: ___________________________ Dependent Variable: ________________________

Control Group: ________________________________ Experimental Group: ________________________

Situations: Read the situation below and design an experiment.

In the statements below, write the hypothesis, variable, control groups and experimental groups.

1. Plants grow best in white light.

Hypothesis: If I use white light, then my plants will grow better.

Independent Variable: white light Dependent Variable: growth

Control Group: no white light (different color) on plants Experimental Group: white light on plants

2. The deer population decreases in the winter due to the lack of food.

Hypothesis: If___________________________________, then ______________________________________

Independent Variable: _____________________________ Dependent Variable: ________________________

Control Group: __________________________________ Experimental Group: ________________________

3. Students who study perform better in school.

Hypothesis: If___________________________________, then ______________________________________

Independent Variable: _____________________________ Dependent Variable: ________________________

Control Group: __________________________________ Experimental Group: ________________________

Read the following situation and answer the following questions.

Suzie Q wants to know the effect of different colors of light on the growth of plants. She believes that plants can survive best in white light. She buys 5 ferns of the same species, which are all approximately the same age and height. She places one in white light, one in blue light, one in green light, one in red light and one in the closet. All of the ferns are planted in Miracle-Grow and given 20 mL of water once a day for 2 weeks. After the two weeks, Suzie observes the plants and makes measurements.

Hypothesis: If I use a certain color light, then plants will grow less than plants with white light.

Independent Variable: colored light Dependent Variable: growth

Control Group: plants with white light Experimental Group: plants with colored light

Constants: Amount of water

What types of measurements can Suzie make on the plants to determine how they did in different types of light? Stem length

Experimental Design Worksheet Name ______________________________

Scientific Method Period ___________ Date______________

Definitions: Define the following words and concepts related to the scientific method.

1. Hypothesis: Your best explanation for something observed in the natural world.

2. Independent Variable: The parameter that changes in the Experimental group. What we’re testing.

3. Dependent Variable: The outcome of the experiment due to the independent variable. This is your data and it will be collected in both the Experimental and Control groups.

4. Control Group: Procedures that are identical to the experimental group EXCEPT for there is NO independent variable.

5. Experimental Groups: Procedures used to test the independent variable.

6. Controlled Variables (Constants): Parameters of both the experimental and control groups that must remain the same.

7. Trials: Number of samples taken during an experiment.

Practice: Write a hypothesis for each of the statements and identify the variables, control group, and experimental group.

1. Cigarette smoking increases the risk of lung cancer.

Hypothesis: If I smoke, then I will get lung cancer

Independent Variable: smoking Dependent Variable: cancer

Control Group: individual that doesn’t smoke Experimental Group: smoking individual

2. Eating breakfast increases performance in school.

Hypothesis: If I eat breakfast, then I will do better in school

Independent Variable: breakfast Dependent Variable: school performance

Control Group: Someone not eating breakfast Experimental Group: Someone eating breakfast

3. Hummingbirds are attracted to the color red.

Hypothesis: If I use a red feeder, then hummingbirds will come and use it.

Independent Variable: red feeder Dependent Variable:hummingbird use

Control Group: other color feeder Experimental Group: red feeder

4. Bats locate food using sound waves.

Hypothesis: If I hide food from a bat, then the bat will be able to use sound waves to

Independent Variable: hidden food Dependent Variable: bat finds food

Control Group: unhidden food Experimental Group: hidden food

5. iBook batteries last for 5 hours.

Hypothesis: If one uses iBook batteries, then the device will last for 5 hours.

Independent Variable: iBook batteries Dependent Variable: length of time

Control Group: device with other batteries Experimental Group: device with iBook batteries

In the statements below, write the hypothesis, variable, control groups and experimental groups.

1. Plants grow best in white light.

Hypothesis: If___________________________________, then ______________________________________

Independent Variable: _____________________________ Dependent Variable: ________________________

Control Group: __________________________________ Experimental Group: ________________________

2. The deer population decreases in the winter due to the lack of food.

Hypothesis: If___________________________________, then ______________________________________

Independent Variable: _____________________________ Dependent Variable: ________________________

Control Group: __________________________________ Experimental Group: ________________________

3. Students who study perform better in school.

Hypothesis: If___________________________________, then ______________________________________

Independent Variable: _____________________________ Dependent Variable: ________________________

Control Group: __________________________________ Experimental Group: ________________________

Read the following situation and answer the following questions.

Suzie Q wants to know the effect of different colors of light on the growth of plants. She believes that plants can survive best in white light. She buys 5 ferns of the same species, which are all approximately the same age and height. She places one in white light, one in blue light, one in green light, one in red light and one in the closet. All of the ferns are planted in Miracle-Grow and given 20 mL of water once a day for 2 weeks. After the two weeks, Suzie observes the plants and makes measurements.

Hypothesis: If___________________________________, then ______________________________________

Independent Variable: _____________________________ Dependent Variable: ________________________

Control Group: __________________________________ Experimental Group: ________________________

Constants: ________________________________________________________________________________

What types of measurements can Suzie make on the plants to determine how they did in different types of light?_____________________________________________________________________________________

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