Lesson 9-1: Independent and Dependent Variables

What is the role of the independent variable in an experiment?

• It is the variable that remains constant.

• It is the result of the experiment.

• It is the cause that we change.

• It is the effect that changes.

In the pancake example, what does the number of servings represent?

• The dependent variable

• The result variable

• The constant variable

• The independent variable

How many cups of mix are needed for 5 servings?

• 20 cups

• 5 cups

• 10 cups

• 15 cups

What is the purpose of using a graph in this context?

• To determine the constant variable

• To find the dependent variable

• To calculate the exact number of servings

• To show the relationship between variables visually

What equation represents the relationship between servings (S) and cups (C)?

• C = S / 2

• C = S + 2

• C = S - 2

• C = 2S

Deon records the amount of time it takes him to jog different distances.

Independent Variable: ​ (a)  

Dependent Variable: ​ (b)  

• Distance
• Time
• Speed
• Calories
• Heart Rate

Lucy studies the heights of seedlings that were grown in rooms with different temperatures.

Independent Variable:​ (a)  

Dependent Variable: ​ (b)  

• Temperature
• Seedlings Height
• Soil Type
• Watering Frequency
• Light Intensity

James records the number of cars that pass through intersection every minute, beginning at noon.

Independent Variable:​ ​ (a)  

Dependent Variable​ (b)  

• Time
• Number of Cars
• Type of Cars
• Weather Conditions
• Traffic Light Duration

Eduardo studies the lengths of necks of giraffes at different ages.

Independent Variable:​ ​ (a)  

Dependent Variable​ (b)  

• Age
• Neck Length
• Height of Giraffes
• Weight of Giraffes
• Color of Giraffes

Soft pretzel are sold at a concession stand for $4.75 each. What are the independent and dependent variables when relating the total cost and the number of soft pretzels purchased?

Independent Variable: ​ (a)  

Dependent Variable: ​ (b)  

• Number of Pretzels
• Total Cost
• Total Cost, Number of Sales
• Price per Pretzel, Total Revenue
• Number of Customers, Profit Earned