Question

name:____________________ period:________________ date:__________________ 2. scenario: a student is testing which brand of paper towel is the most absorbent. he pours 100 ml of water onto a paper towel from three different brands and measures how much water each towel soaks up. manipulated variable responding variable controlled variables 3. scenario: does the temperature of a tennis ball affect how high it bounces? a student heats one ball to 30°c, cools another to 5°c, and keeps a third at room temperature (20°c). she drops each ball from a height of one meter and measures the bounce height. manipulated variable responding variable controlled variables 4. scenario: a researcher wants to see if the amount of fertilizer affects the number of tomatoes a plant produces. she applies different amounts of fertilizer to four identical tomato plants and counts the number of tomatoes on each plant at the end of the season. manipulated variable responding variable controlled variables

Explanation:

Scenario 2:

Step1: Identify manipulated variable

The variable the student changes is the brand of paper - towel.

Step2: Identify responding variable

The variable that changes in response is the amount of water the towel soaks up.

Step3: Identify controlled variables

The amount of water poured (100 mL), the surface on which the towel is placed, etc. are controlled.

Manipulated Variable: Brand of paper - towel
Responding Variable: Amount of water soaked up
Controlled Variables: Amount of water poured, surface on which towel is placed

Scenario 3:

Step1: Identify manipulated variable

The variable the student changes is the temperature of the tennis - ball.

Step2: Identify responding variable

The variable that changes in response is the bounce height of the tennis - ball.

Step3: Identify controlled variables

The drop height (1 meter), the type of tennis - ball, etc. are controlled.

Manipulated Variable: Temperature of tennis - ball
Responding Variable: Bounce height of tennis - ball
Controlled Variables: Drop height, type of tennis - ball

Scenario 4:

Step1: Identify manipulated variable

The variable the researcher changes is the amount of fertilizer.

Step2: Identify responding variable

The variable that changes in response is the number of tomatoes a plant produces.

Step3: Identify controlled variables

The type of tomato plant, the size of the pot, the amount of sunlight, etc. are controlled.

Manipulated Variable: Amount of fertilizer
Responding Variable: Number of tomatoes a plant produces
Controlled Variables: Type of tomato plant, size of pot, amount of sunlight

Answer:

Scenario 2:
Manipulated Variable: Brand of paper - towel
Responding Variable: Amount of water soaked up
Controlled Variables: Amount of water poured, surface on which towel is placed

Scenario 3:
Manipulated Variable: Temperature of tennis - ball
Responding Variable: Bounce height of tennis - ball
Controlled Variables: Drop height, type of tennis - ball

Scenario 4:
Manipulated Variable: Amount of fertilizer
Responding Variable: Number of tomatoes a plant produces
Controlled Variables: Type of tomato plant, size of pot, amount of sunlight