Scientific Skills

The factors in an experiment that can be changed. 

• variables
• quantitative data
• hypothesis
• steps

How many independent variables can be tested in a controlled experiment?

• one
• two
• three
• as many as possible

The basketball is orange with black lines.  

• Observation
• Inference

Mrs. Perry's plant has 6 leaves.

• Observation
• Inference

Mrs. Perry is frowning, so she must be angry.

• Observation
• Inference

What is an inference? 

• Just a guess.
• A statement based off of your observations. 
• The same as an observation. 
• Examples of something. 

Which statement is an observation?

• Her favorite color must be brown.  
• Her hair is brown. 
• Her hair is brown because she dyed it. 
• Her hair has not been cut in two years. 

What two key words must be included in your properly written hypothesis?  

• If...and
• Then...because
• If...then
• If...because

What are "constants" in an experiment?

• factors that remain the same in an experiment
• numbers and values found within an experiment
• factors that change in an experiment
• explanation of your observations

This variable in an experiment is the one being deliberately changed by the scientist. 

• dependent variable
• independent variable
• data
• control group