vocabulary: manipulated variable => responding variable independent variable => dependent...

Vocabulary:

Manipulated variable => responding variable

independent variable => dependent variable

“x” => “y”

Cause => effect

AIM: What are Variables?

VARIABLES

WHAT IS A MANIPULATED VARIABLE?

Thing that you “change” in an Experiment

Manipulated Variable

Independent Variable

“x”

VARIABLES

WHEN YOU CHANGE THE MANIPULATED VARIABLE

THE RESPONDING VARIABLE

IT CHANGES ALSO!

AS an example:AS an example:

How would you devise an experiment How would you devise an experiment which would test whether a fertilizer which would test whether a fertilizer

actually helped plants grow?actually helped plants grow?

What is the independent variable?What is the independent variable?

What is the dependent variableWhat is the dependent variable

VARIABLES

AS an example:AS an example:

How would you devise an experiment How would you devise an experiment which would test whether sunlight which would test whether sunlight

actually helped plants grow?actually helped plants grow?

What is the independent variable?What is the independent variable?

What is the dependent variableWhat is the dependent variable

VARIABLES

AS an example:AS an example:

How would you devise an experiment How would you devise an experiment which would test whether Mr. Z’s which would test whether Mr. Z’s

fish could live in salt water?fish could live in salt water?

What is the independent variable?What is the independent variable?

What is the dependent variableWhat is the dependent variable

VARIABLES

EXAMPLE: Suppose you did a study EXAMPLE: Suppose you did a study which concluded that the more a which concluded that the more a student studies the higher grade a student studies the higher grade a

student receivesstudent receives

What is the manipulated variable?What is the manipulated variable?

What is the responding variableWhat is the responding variable

VARIABLES

EXAMPLE: Suppose you did a study EXAMPLE: Suppose you did a study which concluded that the older which concluded that the older people become, then the higher people become, then the higher

becomes their IQbecomes their IQ

What is the manipulated variable?What is the manipulated variable?

What is the responding variableWhat is the responding variable

VARIABLES

EXAMPLE: Suppose you did a study EXAMPLE: Suppose you did a study which concluded that the more which concluded that the more

children watch TV, then the lower children watch TV, then the lower their SAT scorestheir SAT scores

What is the manipulated variable?What is the manipulated variable?

What is the responding variableWhat is the responding variable

VARIABLES

EXAMPLE: Suppose you did a study EXAMPLE: Suppose you did a study which concluded that the more which concluded that the more

fertilizer a plant receives, then the fertilizer a plant receives, then the more flowers it produces more flowers it produces

What is the manipulated variable?What is the manipulated variable?

What is the responding variableWhat is the responding variable

VARIABLES

EXAMPLE: Suppose you did a study EXAMPLE: Suppose you did a study which concluded that oceans which which concluded that oceans which

have a higher “salt” content will have have a higher “salt” content will have less fish less fish

What is the manipulated variable?What is the manipulated variable?

What is the responding variableWhat is the responding variable

VARIABLES

EXAMPLE: Suppose you did a study EXAMPLE: Suppose you did a study which concluded that the faster a car which concluded that the faster a car travels, the less its fuel economy will travels, the less its fuel economy will

be be

What is the manipulated variable?What is the manipulated variable?

What is the responding variableWhat is the responding variable

VARIABLES

EXAMPLE: Suppose you did a study EXAMPLE: Suppose you did a study which concluded that as the average which concluded that as the average

temperature in a pond increases, then temperature in a pond increases, then the the average number of frog the the average number of frog “croaks” “croaks” (per minute)(per minute) increases increases

What is the manipulated variable?What is the manipulated variable?What is the responding variableWhat is the responding variable

VARIABLES

Those we try to Change (Cause)

• Independent Variable

• Manipulated Variable

• X variable

Those we try to Change (Cause)

• Independent Variable

• Manipulated Variable

• X variable

The result of the Change (effect)

• dependent variable

• responding variable

• Y variable

The result of the Change (effect)

• dependent variable

• responding variable

• Y variable

Consider This: Will a house plant grow better in a warm

room or a colder room

What is going to be the manipulated variable?

The Temperature of the Room

VARIABLES

Consider This: Will a house plant grow better in a warm

room or a colder room

What is going to be the responding variable?

Plant Growth

VARIABLES

EXAMPLE: Lava from a Hawaiian EXAMPLE: Lava from a Hawaiian volcano travels a 20 feet every minute volcano travels a 20 feet every minute

What is the manipulated variable?What is the manipulated variable?

What is the responding variableWhat is the responding variable

Time => distanceTime => distance

VARIABLES

1. Identify the problem being investigated

2. Identify the manipulated variable and the responding variable

3. Identify which one CAUSES the other one to change

TIPS FOR IDENTIFYING VARIABLES

VARIABLES

REVIEW Manipulated variable => responding variable independent variable => dependent variable

“x” => “y”

VARIABLES

Class Handout Activity pg. 46: Controlling Variables

Graph Data Table

VARIABLES

Homework:

Internet Questions

Finish a Graph of the Data Table

VARIABLES