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What is a Hypothesis? What is a Hypothesis?

What is a Hypothesis? - PowerPoint Presentation

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Uploaded On 2018-01-18

What is a Hypothesis? - PPT Presentation

How does a hypothesis begin What do you do with it How do you make one How does a hypothesis begin Scientists make lots of observations This leads them to form scientific questions about what they have observed Each scientist creates an explanation or hypothesis that he or sh ID: 624651

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Slide1

What is a Hypothesis?

How does a hypothesis begin?What do you do with it?How do you make one?Slide2

How does a hypothesis begin?

Scientists make lots of observations. This leads them to form scientific questions about what they have observed. Each scientist creates an explanation – or hypothesis – that he or she thinks will answer the question.

Slide3

How does a hypothesis begin?

A scientist bases his/her hypothesis both on what he or she has observed, and on what he or she already knows to be true.Slide4

Making a hypothesis is a step in the Scientific Method

The 7 basic steps of the scientific method:

Asking a question

Completing research

Making a hypothesis

Planning an investigation

Recording and analyzing data

Explaining the data

Communicating the resultsSlide5

Example question

A scientist notices that the tomato plant closest to her neighbor’s yard is much taller than any of the other plants in her garden bed. She also notices that the neighbor turns on his sprinkler system every day, and that some of this water reaches only her big plant. The scientist creates a question: Does daily watering from a sprinkler make a tomato plant grow faster than other tomato plants?Slide6

Example hypothesis

The scientist creates this hypothesis to address her question: “If I water the tomatoes in my garden daily then they will grow faster because tomatoes grow more when they get more water.”Slide7

What do you do with a hypothesis?

The hypothesis that a scientist creates leads him or her to make a prediction that can be tested next in an investigation. Slide8

What do you do with a hypothesis?

Notice how the example scientist’s hypothesis makes a prediction that can be tested:

“If I water the tomatoes in my garden daily then they will grow faster because tomatoes grow more when they get more water.”

What will the scientist do in the investigation to test her hypothesis?Slide9

A hypothesis is not just a prediction

In science a prediction is an educated guess about the expected outcome of a specific test

In science a hypothesis goes further

A hypothesis includes a possible explanation about why the expected outcome of a test will occurSlide10

Prediction vs. hypothesis

Example Prediction: If it gets cold outside the leaves will change colors.Example Hypothesis: If it gets cold outside then the leaves will change color because leaf color change is related to temperature.Slide11

How do you write a hypothesis?

A good hypothesis includes two parts: 1. a prediction about the outcome of a

scientific investigation

----and----

2. an explanation for why those results

will occurSlide12

How do you write a hypothesis?

A hypothesis is worded as a prediction about what will happen if you change somethingExample: If students eat a lot of candy then they will get more cavities because sugar on teeth causes cavities.Slide13

How do you write a hypothesis?

A good hypothesis is worded like this:

If…..then…...because…….

OR

I predict…because

I think…becauseSlide14

Hypothesis example

If

students eat a lot of chocolate

then

they will get a sick stomach

because a lot of chocolate all at once is hard for the stomach to digest.Slide15

If….then….because….

After the word “If”… explain what will change in the investigationAfter the word “then” …write what you predict will happen as a result of that changeAfter the word “because” …explain why you think the result will happen Slide16

Another hypotheses

If salt is added to a plant’s soil then the plant will die because salt will dry out the soil so that there is not enough water left for the plant.Slide17

Another Hypothesis

If people spend more time in the sun then they will be more likely to get skin cancer because exposure to ultraviolet light in sunlight causes skin cancer.