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A hypothesis is a prediction based on what you know so far. It is what you think is going to happen.

Keyword: Relationship

A relationship is how one thing affects another.

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A hypothesis tries to connect two things together and explain or predict their relationship.

A relationship is when two things affect each other.

For example there is a relationship between your age and shoe size.

Hypothesis are written using an if...then... statement.

If then statements are used to write predictions/hypothesis because they show how two things possibly connect.

In the example above the hypothesis could be: if you get older then your shoe size will increase.

Another example could be a relationship between the amount of time a person plays video game and his or her body mass.

The possible hypothesis could be: if you video game more than 2 hours a day then your body mass will increase.

1. Each group has been given a piece of chart paper. Fold it in half.

2. On the left side write the title hypothesis.

3. Under the title write the subheadings Experiment 1, Experiment 2 and Experiment 3.

On the right side write the title-- Success Criteria: How to write a good hypothesis. Look at the example on the board.

In groups, write possible hypothesis for the following relationships on the chart paper. Use the if … then format.

Experiment 1: Pumping and balloon size.

Experiment 2: Throwing a ball up in the air.

Experiment 3: Putting a cup of water in the freezer

Let’s do an experiment!

Procedure:

Crumple up the paper so that it fits into the bottom of the cup.
Turn the cup upside down to make sure the paper does not fall out.
Touch the paper.
Put the cup in the water bowl upside down. The mouth of the cup must be put into the water first. The cup must be upside down with the paper in it when put into the water.
Hold the cup in the water for 10 seconds timed.
Now pull out the cup without turning it. Keep the cup upside down.
Now you are to touch the paper in cup to identify whether it is wet or dry.

Materials:
1 transparent plastic cup 1 Piece of paper	1 litre of water 1 bucket	1 clock or stopwatch

Now write a hypothesis:

If I _____, then _______.

Let us discuss your possible hypothesis now.

Now as a group write a checklist of how to write a good hypothesis.

Extra Time

Experiment 3: Putting a cup of water in the freezer. (make a prediction)

Experiment 4: Eating cabbage and throwing up.

Experiment 5: Watering and plant size.