Controlled Experiments

What is a controlled experiment?

Poll

How are you feeling today?

• Fine

• Tired

• Happy

• Anxious

Multiple Choice

What are we going to learn today?

• About Biotechnology

• More Science Research

• The Scientific Method

Multiple Select

why do scientists set up a controlled experiment?

• They don't know what to expect

• To objectively reach a conclusion.

• To support their hypothesis based on the data collected

• To refute their hypothesis based on the data collected

Fill in the Blanks

Writing the temperature will be a _ variable , where as stating if it is hot or cold will be a _ variable

Multiple Choice

Another name for the independent variable is...

• The responding variable

• The manipulated variable

Multiple Choice

Another name for the dependent variable is...

• The responding variable

• The manipulated variable

What is a Scientific Question?

Based on your observations, you pose a testable question. 

• This question will be then be answered with a hypothesis

• It  will also state a possible outcome called a prediction.

Multiple Choice

A possible scientific question can be one of the following

• Will my dog like steak or chicken?

• Does Tylenol or Aspirin have a better taste?

• Can the sun rise on the West coast?

Multiple Select

In an experiment that is verifying that sugars are made by plants when exposed to light, which will be the experimental control?

• The plant that has sugars

• The plant with fertilizer

• The plant in the light

• The plant in the dark

Multiple Select

In the experiment with the weights and the sound emitted by the string, the weights are the...

• the dependent variable

• the manipulated variable

• the independent variable

• the responding variable

Fill in the Blanks

A possible hypothesis about the effect of changing the weights on the sound the string makes can be...

If the _ is changed

Multiple Select

A possible prediction for the experiment for the weights and the sound the string emits can be....

• The increase on the weight on the string will increase the pitch of the sound

• The sound will change when I change the weight

• A decrease in the weight on the string will decrease the pitch of the sound.

• I will change the weight on the bucket and then I will see the string moving.

Multiple Choice

A possible hypothesis with a prediction for the experiment the boys are performing is:

"If the weight on the string increases, then the string will emit a low pitch sound."

• True

• False

Multiple Choice

Why do scientists perform controlled experiments?

• Because it is organized better

• To test one variable at a time

• Because scientists like to control the results of the experiments.

Multiple Choice

Why did the boys perform the experiment without any weights?

• The empty basket is the experimental variable.

• The empty basket is the control variable.

• The empty basket is a mistake in the experiment

Multiple Select

Treatments and Replicates are done to ensure

• The experiment's results are objective

• To avoid sources of error

• To double the results

• To use as many materials and chemicals available.

Open Ended

How is the knowledge of how scientists work help you be a responsible scientific literate citizen?