The Scientific Method Day 3 Hypothesis

The Scientific Model

Day 3: Hypothesis

Review

First let's remember and review what we learned yesterday.

Multiple Choice

Which is better, cats or dogs?

• Testable

• Non-testable

Multiple Choice

Is this a testable question?

What makes plants grow best?

• Yes

• No

Multiple Choice

Does the type of paper affect the distance a paper airplane will fly? What is the DEPENDENT variable?

• The distance

• Type of paper

• Flying

• Length of paper

Controlled Variables

Controlled variables are the third type of variables.

What Is A Hypothesis?

• It's a prediction

• It's an educated guess

• It's a testable explanation to a question

• It's an If...Then statement

​Your hypothesis is an educated guess about what will happen when you do your experiment

Multiple Choice

When is a hypothesis written?

• before you decide on a question

• after the experiment

• before the experiment

• after the conclusion

When Writing A Hypothesis

• First, write If... followed with the independent variable

• Next, write Then... followed with the dependent variable

• Because....why you think that (based on your research)​

Multiple Choice

When writing your hypothesis, what information follows IF?

• dependent variable

• how you know it will happen

• independent variable

• anything

Multiple Choice

When writing a hypothesis, what information do you fill in after THEN?

• dependent variable

• independent variable

• how you know it will happen

• anything good

Testable Question

What effect does studying with music have on student test scores?

Multiple Choice

What is the Independent Variable in the testable question:

What effect does studying with music have on student test scores?

• Studying with music

• Student test scores

Independent Variable

Studying with music

Multiple Choice

What is the Dependent Variable in the testable question:

What effect does studying with music have on student test scores?

• Studying with music

• Student test scores

Dependent Variable

Student test scores

Multiple Choice

What is the correct hypothesis to the testable question:

What effect does studying with music have on student test scores?

• If students study and their test scores increase, then they will listen to music because music helps them to relax

• If students study with music, then their scores will increase because music helps them to relax

• If students study, then their scores will increase

Hypothesis

If students study with music, then their scores will increase because music helps them to relax

Another example

Testable Question

How does the amount of leaves on a tree affect how many birds will build nests in it?

Independent Variable - amount of leaves on a tree

Dependent Variable - amount of birds building nests in the tree

Hypothesis

Hypothesis - IF there are a lot of leaves on the tree, THEN there will be more birds building nests in it, BECAUSE there is more shade to protect the birds.

Multiple Choice

What is a hypothesis?

• the thing changed on purpose in the experiment

• an explanation about what you observed

• using your 5 senses to gather data

• an educated guess about the outcome of an experiment

Multiple Choice

Performing a test or experiment allows you to test your ___________.

• draw conclusions

• hypothesis

• senses

• battery

Multiple Choice

Choose the correct hypothesis for "How will exercising affect your health?"

• IF you have better health, THEN you will exercise.

• IF you exercise, THEN you will have better health.

• Exercising means you're healthy.

Multiple Choice

Which of the following hypotheses is written correctly?

• If I freeze a tennis ball, then it will not bounce as high because the outer shell turns very hard.

• If a tennis ball is frozen, it won't bounce as high as one that is not frozen because it is too hard.

• Frozen tennis balls will not bounce as high.

• If I heat up a tennis ball it will bounce high

Add to Your Packet

Your Question, Hypothesis and Variables

• There is not a spot on your packet to add the question, please add that above the hypothesis.

• Then add your hypothesis.

• Add BOTH the Independent and dependent variables.

  • Stop after that and go on with the slides.

Materials

What do you need for your experiment?

Listing the materials for your experiment will help you prepare.


- Don't add to your packet until told to do so-

Example:

If you were going to do an experiment to answer the question: How does the temperature of water affect how fast sugar dissolves?

My material list would be: 3 clear cups, measuring cups, Sugar, Spoon for stirring, Thermometer, Hot water, room-temperature water, and ice water

Another Example:

If you were going to do an experiment to answer the question: Does the type of paper towel affect how much water it absorbs?

My material list would be: 3 brands of paper towels, Measuring cup, Water, Bowl or container for soaking, Ruler (to measure paper towel size), Stopwatch

Talk with your partner

If you were going to do an experiment to answer the question: How many drops of water can fit on different size coins?

What would your material list be?

Multiple Select

What would be on your material list for: How many drops of water can fit on different size coins?

• eye dropper

• coins: penny, nickel, dime.

• a stopwatch

• cup of water

Add to Your Packet

What materials would you need for your experiment?

Create a list in your packet in the materials section of the materials that you will need to do your experiment.

- Stop after that and go to the next slide.

Procedure

The procedure is the steps that you will take to complete your experiment.

Example:

If my question is: Does the type of paper affect how far a paper airplane flies?

My procedure might be:
1. Fold three paper airplanes using different types of paper (printer
paper, construction paper, and cardstock).
2. Mark a starting line on the floor.
3. Throw each airplane from the starting line.
4. Measure the distance each airplane flies.

5. Compare the results to determine which paper type worked best.

Another Example:

If my question is: What is the effect of temperature on the speed of dissolving sugar?

My procedure might be:
1. Fill three cups with hot, room-temperature, and cold water.

2. add a spoonful of sugar to each cup and stir.

3. Time how long it takes for the sugar to dissolve in each cup.

4. Compare the results to see which temperature dissolves sugar the fastest.

Add to Your Packet

What will your procedure be?

Add the steps of your experiment to your packet.

End of Lesson