Experimental Variables (IV & DV)

Experimental Variables (IV & DV)

Scientific Method & Variables Lesson

Poll

I understand and know what the scienitic method is.

• Yes

• No

• Somewhat

• I have no idea!!!

Multiple Choice

What is the scientific method?

• A systematic procedure for how to conduct a scientific experiment

• The process of solving a problem

• A way of making non-scientific observations

• A way to summarize findings from multiple investigations

Multiple Choice

What is a hypothesis?

• An educated prediction or answer to a testable question

• A random guess

• An observation based on feelings or emotions

Multiple Choice

An observation that is measurable and made with tools (such as a ruler or scale) is what type

• quantitative

• qualitative

• koalatative

Multiple Choice

After the data is analyzed the hypothesis is stated as correct or incorrect in the __________

• conclusion

• experiment

• hypothesis

• table of contents

Multiple Choice

Which of these contains the steps of the scientific method in the correct order?

• Ask a question, do background research, state your hypothesis, conduct an experiment, analyze data, make a conclusion

• State your hypothesis, ask a question, do background research, conduct an experiment, analyze data, make a conclusion

• Ask a question, state your hypothesis, do background research, conduct an experiment, make a conclusion, analyze data

• State your hypothesis, ask a question, do background research, make a conclusion, conduct an experiment, analyze data

Poll

I understand and know what the scienitic method is.

• Yes

• No

• Somewhat

• I have no idea!!!

Poll

I know how to identify the independent, dependent, and controlled variables (constant).

• Yes

• No

• Somewhat

• I have no idea!!!

Multiple Choice

Molly investigated if the age of students caused them to be better drivers. What is the independent variable?

• Type of car

• Skill of driving

• Age of student

Multiple Choice

Molly investigated if the age of students caused them to be better drivers. What is the dependent variable?

• Type of car

• Skill of driving

• Age of student

Multiple Choice

Sam wanted to know if the color of the chair you sat in when taking a test affected your test grade. What is the independent variable.

• Color or chair

• Grade on test

• Age of students

Multiple Choice

The part of the experiment that remains the same for the control and experimental group.

• constants

• control

• independent

• dependent

Multiple Choice

Sam wanted to know if the color of the chair you sat in when taking a test affected your test grade. What is the dependent variable.

• Color or chair

• Grade on test

• Age of students

Multiple Choice

Robert wanted to know if the type of phone you used gave you better or worse service. What is the independent variable. 

• Location of phone call

• Type of phone

• How good the service was

Multiple Choice

Robert wanted to know if the type of phone you used gave you better or worse service. What is the dependent variable. 

• Location of phone call

• Type of phone

• How good or bad the service was

Multiple Choice

Sarah wanted to find out if the size of a car tire made it a smoother ride over bumps. What is the independent variable?

• Size of tire

• How smooth the ride was over bumps

• Type of car

Multiple Select

Cindy wanted to find out how the amount of sunlight affects the growth of plants. She placed two tomato plants in 10 inch pots with potting soil and watered them ¼ cup each day. One plant was placed under a cardboard box and one was placed in the sunlight. She measured the growth of the plant each week for three weeks.

What are two controlled variables? (Select 2)

• Using the same type of plant

• Each plant was placed in a 10 inch pot

• The growth of the plant

• One plant is in the sunlight and the other is under a box

Multiple Choice

Sarah wanted to find out if the size of a car tire made it a smoother ride over bumps. What is the dependent variable?

• Size of tire

• How smooth the ride was over bumps

• Type of car

Multiple Choice

Penelope wanted to see if the temperature of the oven made cookies softer or harder. What is the independent variable.

• Hardness of cookie

• Type of oven

• Temperature of oven

Multiple Choice

Penelope wanted to see if the temperature of the oven made cookies softer or harder. What is the dependent variable.

• Hardness of cookie

• Type of oven

• Temperature of oven

Poll

I know how to identify the independent, dependent, and controlled variables (constant).

• Yes

• No

• Somewhat

• I have no idea!!!

Poll

I know how to identify the independent and dependent variables on graphs and tables.

• Yes

• No

• Somewhat

• I have no idea!!!

Multiple Choice

• the independent variable is distance

• the independent variable is d=25 t

• the dependent variable is time

• the dependent variable is distance

Multiple Choice

Which of the following is the label for the independent variable.

• Money Collected

• Raising Money

• Boxes Sold

• None of the above

Multiple Choice

On a graph, which axis shows the independent variable?

• x-axis

• y-axis

• neither

• it changes

Multiple Choice

The graph shows the cost of mailing a package based on its weight.  Which statement is true about the situation?

• The dependent variable is total cost

• The dependent variable is weight

• The independent variable is total cost

• The independent variable is cost of a package

Multiple Choice

In the table, Bubbles is the ______________.

• independent variable

• dependent variable

Multiple Choice

Which label best describes the independent quantities shown in the table?

• Number of tickets (t)

• Cost (c)

Poll

I know how to identify the independent and dependent variables on graphs and tables.

• Yes

• No

• Somewhat

• I have no idea!!!

​Bringing it All Together

​

Multiple Choice

The factors that stay the same or are constant throughout the experiment.

• Controlled Variable

• Dependent Variable

• Independent Variable

Multiple Choice

Changes in the _________ variable causes changes in the _________ variable.

• independent; dependent

• dependent; independent

Multiple Choice

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.

What is the dependent variable?

• Dropping the same way

• Wing Length

• Amount of time it takes the helicopter to hit the floor

• Dropping from the same height

Multiple Select

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.

What are two controlled variables? (Select 2 answers)

• Dropping the same way

• Wing Length

• Amount of time it takes the helicopter to hit the floor

• Dropping from the same height

Multiple Choice

Cindy wanted to find out how the amount of sunlight affects the growth of plants. She placed two tomato plants in 10 inch pots with potting soil and watered them ¼ cup each day. One plant was placed under a cardboard box and one was placed in the sunlight. She measured the growth of the plant each week for three weeks.

What is the independent variable?

• Using the same type of plant

• Each plant was placed in a 10 inch pot

• The growth of the plant

• One plant is in the sunlight and the other is under a box

Multiple Choice

Stacy measured the speed of 5 birds that lived around her house. What is the Independent variable?

• Type of Bird

• Speed of Bird

• weather outside

Multiple Choice

Stacy measured the speed of 5 birds that lived around her house. What is the dependent  variable?

• Type of Bird

• Speed of Bird

• weather outside

Multiple Choice

Mrs. Cote wanted to know if the iPhone could stand up against being dropped from different heights. She dropped them from 3 heights and saw if they broke. What is the independent variable?

• Drop height

• If they had a case on them or not

• If they broke

Multiple Choice

Mrs. Cote wanted to know if the iPhone could stand up against being dropped from different heights. She dropped them from 3 heights and saw if they broke. What is the dependent variable?

• Drop height

• If they had a case on them or not

• If they broke

Multiple Choice

Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the independent variable 

• Type of fertilizer

• Size of sunflower

• type of sun flower

Multiple Choice

Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the dependent variable 

• Type of fertilizer

• Size of sunflower

• Type of sunflower

Multiple Choice

Molly investigated if the age of students caused them to be better drivers. What is the dependent variable?

• Type of car

• Skill of driving

• Age of student

Multiple Choice

Sam wanted to know if the color of the chair you sat in when taking a test affected your test grade. What is the dependent variable.

• Color or chair

• Grade on test

• Age of students

Multiple Choice

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

• dependent variable

• independent variable

• data

• control group

Multiple Choice

The part of the experiment that remains the same for the control and experimental group.

• constants

• control

• independent

• dependent

Multiple Choice

Carey and Justin are raising money to purchase books for the library. The more money they raise, the more books they will be able to purchase for the library.

Which of the variables is dependent?

• amount of money raised

• number of books

Multiple Choice

In a controlled experiment, how many variables can be worked with at a time? 

• one

• none

• two or more

• how ever many makes sense.

Multiple Choice

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp.  Identify the independent variable.

• distance traveled by the ball

• height of the ramp

• mass of the ball

• weight of the ball

Multiple Choice

An investigation was done to see if keeping the lights on for different amount of time each day affected the number of eggs the chicken lay.  Select the dependent variable.

• Keeping the lights on

• Amount of time each day

• Number of eggs the chicken lay

• Investigation

Multiple Choice

The score on the final test depended on the number of study questions the student completed.  Select the independent variable.

• Score on final test

• Number of study questions

• Student

• None of these

Multiple Choice

The independent variable is:

• x

• y

Multiple Choice

The dependent variable is:

• x

• y

Multiple Select

Select the correct independent and dependent parts of the graph .

(choose 2 answers)

• The dependent variable is total cost

• The dependent variable is weight

• The independent variable is total cost

• The independent variable is the weight of the package

Multiple Select

Select the correct independent and dependent parts of the graph .

(choose 2 answers)

• The independent variable is distance

• The independent variable is time

• The dependent variable is distance

• The dependent variable is time

Multiple Choice

Steve wanted to see if the type of fertilizer made sunflowers grow larger. He applied three different kinds of fertilizer on three sunflowers, and observed the size of the sunflower after 2 weeks. The size of the sunflower is the...

• independent variable

• dependent variable

Multiple Choice

Molly investigated if the age of students caused them to be better drivers. She compared the number of accidents that 16 year olds, 17 year olds, and 18 year olds each had in Birmingham over the last 5 years. The age of the student is the...

• independent variable

• dependent variable

Multiple Choice

Molly investigated if the age of students caused them to be better drivers. She compared the number of accidents that 16 year olds, 17 year olds, and 18 year olds each had in Birmingham over the last 5 years. The number of accidents is the...

• independent variable

• dependent variable

Multiple Choice

Sam wanted to know if the color of the chair you sat in when taking a test affected your test grade. For one class, he had students sit in red chairs, and for another he had them sit in blue chairs. What is the independent variable?

• Color or chair

• Grade on test

• Age of students

Multiple Choice

Sam wanted to know if the color of the chair you sat in when taking a test affected your test grade. For one class, he had students sit in red chairs, and for another he had them sit in blue chairs. What is the dependent variable?

• Color or chair

• Grade on test

• Age of students

Multiple Choice

The measurable factor in an experiment is known as the: 

• Control

• Independent Variable

• Constant

• Dependent Variable

Multiple Choice

Robert wanted to know if the type of phone you used gave you better or worse service. What is the independent variable. 

• Location of phone call

• Type of phone

• How good the service was

Poll

I completely understand the scientific method and how to identify the independent, dependent, and controlled variables (constant).

• Yes

• No

• Somewhat

• I have no idea!!!