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In this video we will discuss how to think about and test your experiment.

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We will look at equipment and we will talk about why testing your experiment is important.

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When you think about the equipment consider your research question.

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The research question in my example IA is how does the height of the water in a glass affect

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the frequency of the sound? Now based on your research question think about what you will do

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in your experiment and make a list of the equipment that you will need. In my experiment I will

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fill a glass with water so I need a glass, water and measuring tape. I will hit the side of the

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glass with a metal spoon to create the sound wave and I need to find a way to measure the

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frequency of the emitted sound. After doing some research and considering different options

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I decided to use the Google Science Journal app. Before you go any further please make sure that

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you have access to all equipment. It would be a waste of time and energy to write parts of your IA

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and then find out that your experiment is not viable. You might have to talk to your physics

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teacher or lab technician at your school to see if you have access to all the equipment that you need.

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Once you confirmed that you have access to all equipment it's time to test your experiment.

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This might seem like extra work now but it is a crucial step. If you find out that your

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experiment does not work or does not provide you with high quality data you can still change it

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before writing parts of your IA. Testing your experiment at this point will save you time

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and energy in the long run. You will need to set up your equipment and collect some data.

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It's the best to carry out tests at the highest and lowest values of the independent variable.

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In my experiment I used a glass with a height of 13 centimeters. So my highest independent

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variable value is 12 centimeters and the lowest value is when the glass is empty so 0 centimeters.

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I recorded the frequency of the emitted sound wave for a water level of 12 centimeters a few

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times and got these values. For an empty glass I got these values. So through testing my experiment

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I confirmed that it is easy to change the independent variable, easy to measure the

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dependent variable and that the dependent variable gives a good range of data. If for

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example at 0 centimeters I would have gotten values close to 710 hertz my experiment would

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probably not give me a good range of data and I might need to rethink what I want to do.

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And the final plea please please test your experiment because I have seen several students

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in the past waste a lot of time later in their IA process because they did not make sure that

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their experiment works properly. This completes step one action three now you know how to think

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about and test your experiment. In the next video we will discuss how to write your introduction.