Notes 1 SPI 0807.Inq.1 (Variables and Controls) Step 1: Ask A Question Step 2: Form A Hypothesis...

Notes

1

SPI 0807.Inq.1 (Variables and Controls)

Step 1: Ask A QuestionStep 2: Form A HypothesisStep 3: Test The HypothesisStep 4: Analyze The ResultsStep 5: Draw ConclusionsStep 6: Communicate ResultsStep 7: Make Observations

Scientific Method

(In List Format)

Use dependent variables when you test your hypothesis by doing experiments

Press the Right Arrow Button to Advance through the Presentation!

Dependent Variables in Experiments Used with the scientific method

In an experiment… …you should only test for ONE key thing at a time When you repeat the experiment… …only change this ONE key thingThis one thing is called…

ANYTHING ELSE THAT CHANGES IS CALLED…

Notes SPI 0807.Inq.1 (Variables and Controls)

2

2 Types of VariablesIndependent & Dependent



3


So What Is A Dependent Variable? Other factors that change because of the independent variable These are the things that YOU DO NOT CHANGE…they

change on their own In other words, anything that changes on its own will be a…

Imagine you are doing an experiment to determine which brand of gum will have flavor that lasts the longest. The one thing you will change each time is the brand of gum So the independent variable is the brand of gum How long the flavor lasts will change on its own So the dependent variable is how long the flavor lasts

The independent variable is…


4

The dependent variable is the student’s rating

You decide to do an experiment to determine the reason certain soft drinks are more popular that other soft drinks. You suspect that the popularity of the drinks is connected with the amount of sugar found in them. You decide to use Coke, Pepsi, and Dr. Pepper in this experiment. You first determine how much sugar each drink contains. Then you get 6 students to do a blind taste test with all 3 drinks. They rate each drink on a scale of 1 to 10.


Example 01

the type of soft drink

So what is the dependent variable?

HINT: What is a factor that changed without you doing it?

Example 02:

A scientist is conducting an experiment to test how sunlight affects plant growth. She places one corn plant 1 meter away from a sunlamp. She places one corn plant 2 meters away from a sunlamp. She places one corn plant 3 meters away from a sunlamp.


5

The dependent variable is the plant growth


The independent variable is…the amount of sunlight



Example 03: A student conducts an experiment with ten 8th grade students (5 boys and 5 girls). He uses 3 similar types of sour candy (Sour Skittles, Sour Patch Kids, and Warheads) in a series of 4 trials. He gives 1 piece of candy to each student and records their facial expressions as they eat it.


6

The dependent variable is the student’s facial reactions


The independent variable is…the type of sour candy



Example 04: A student conducts an experiment to determinewhich type of glue works best for attaching two pieces of regularwriting paper together.

He uses 3 types of Elmer’s glue in a series of experiments (1) Liquid-washable, (2) Glue Stick-washable, (3) Glue Stick-nonwashable) He places the same amount of glue (2g) on each sheet of paper.


7

The dependent variable is how strongly the sheets of paper stick together


The independent variable is…the type of glue



Example 05: A student conducts an experiment to determine whichink color in ballpoint pens will last the longest before running out.

She uses 3 ink colors in 3 ballpoint pens in a series of experiments. (1) Black ink pen, (2) Blue ink pen, (3) Red ink pen) She copies text from his science book. She copies the same text overand over. She writes at the same speed. The room temperature remains the same. She writes on the same kind of paper.


8

The dependent variable is how long ink lasted


The independent variable is…the ink color So what is the dependent variable?HINT: What is a factor that changed without you doing it?

Notes 1 SPI 0807.Inq.1 (Variables and Controls) Step 1: Ask A Question Step 2: Form A Hypothesis...

Documents

Transcript of Notes 1 SPI 0807.Inq.1 (Variables and Controls) Step 1: Ask A Question Step 2: Form A Hypothesis...