DESIGNING AN EXPERIMENT

HYPOTHESIS

Form a hypothesis

If…Then…

If we water the plants with Miracle Grow, then the plants will grow taller.

DESIGN THE EXPERIMENT

Experiments are conducted under controlled conditions

A variable is a part of an experiment

Two types of variables:Dependent Variable and Independent Variable

VARIABLES

The dependent variable is changed because of changes in another variable

The independent variable is controlled by the scientist to see how it affects the dependent variable

The value of the dependent variable depends on the independent variable

CONTROL

A control is the standard that an experimental result is compared to

Without a control your experiment is worthless!!!

A constant are factors that do not change within an experiment

LETS GIVE IT A TRY

Farmer Bob wants to see if Miracle Grow will help his garden grow. He wants to set up an experiment to test if the Miracle Grow will have an effect on his plants or not. How could Farmer Bob test the Miracle Grow?

FARMER BOB’S EXPERIMENTFarmer Bob can plant two gardens. Garden “A” will be watered with Miracle Grow and garden “B” will not.

What is the independent variable?The Miracle Grow

What is the dependent variable?The size of the plants

What is the control?Garden B

What are some constants?Soil, water, sunlight, temperature, time