A hypothesis is a prediction or an attempt to answer the question that was developed. It is written with a cause and effect format: If (I do this), then (this) will happen.
Writing a hypothesis is easier when the variables are identified first. Variables are what changes in the experiment. When planning your controlled experiment using the scientific method, you will have independent, dependent, and constant variables.
|Independent Variable (IV)||This is what is being changed or manipulated in the experiment.|
|Dependent Variable (DV)||This is the effect of the independent variable. It is what is measured or data is collected on.|
|Constant Variable (CV)||This is what stays the same throughout the experiment. For a controlled experiment, you want to change only one thing and keep the rest unchanged throughout.|
How is this related to our hypothesis: If IV, then DV will happen.
For an example let’s go back to our computer analogy.
If I plug the computer in then it will turn on.
Instructions: Identify the variables for Sally’s experiment. Write a hypothesis using the format you learned.
|Independent Variable (IV)||Type of soil: compost, coco coir, sand, potting soil|
|Dependent Variable (DV)||Height of plant|
|Constant Variable (CV)||Type of plant, location of plants, amount of sunlight, amount of water, type of pot|
Using the following format come up with a good hypothesis for Sally’s experiment.
If ________IV_________ then _______DV_________ .
Write your idea for a hypothesis down in your journal.