Hi, I'm Jim Shields for About.com and today I'm going to teach you about how to write a hypothesis for a Biology lab report. Your hypothesis is a statement that you can test. You may begin with a question, but your hypothesis will end up as a statement that you will set out to prove. Because you are trying to prove it to be true, it needs to be testable. The hypothesis will include the two variables you are working with: an independent variable, which is what you will input or apply in the experiment, and the dependent variable, which is what will result from your input. Here's an example from one of my students. She wondered if caffeine enhanced performance. So she started with a question “Does drinking coffee help me do things faster?” To come with a hypothesis, she had to narrow the question and change it to a statement, which is an untested answer to the question. To be testable, you need to limit the statement to two variables that you can control. For her independent variable, my student chose caffeine, which is the stimulant in coffee. For her dependent variable, she needed to choose an action that is easily measurable, so she chose typing speed. Her hypothesis was, “People type faster after drinking coffee since caffeine in the coffee is a stimulant.” Her input, caffeine into her subjects in the form of coffee, will result in an output, which is typing speed. This makes a good hypothesis. Thanks for watching. To learn more about biology, visit us on the web at About.com.

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