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## PowerPoint Slideshow about ' Scientific Method' - ruana

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### Let’s Look at an Example!

Define the Problem

- Make sure you know what the problem is.
- State the problem as a clear question.
- Will the use of Exxon gasoline give my car better gas mileage?

Research the Problem

- Find out all you can concerning your problem
- Use the Library
- Magazines
- The internet
- Personal Interviews

Form a Hypothesis in the form of an “If -Then” Statement

- The first part of the statement represents the problem, while the second part represents the proof you are looking for.
- Examples:
- If I spend my money on a new CD, then I will not have enough to go to the movies.
- If I use Exxon Gasoline, then my car will get better gas mileage.

Develop a Controlled Experiment

- All experiments contain variables (things found in the experiment).
- The Experimental variable is the thing being tested
- The Control variables are the other things having an effect on the experimental variable
- These must be kept identical

Gasoline’s Affect on Car Mileage.

What are Some Possible Variables?

- Car type
- Gasoline type
- Driver
- Driving Conditions
- Amount of gasoline
- Tires
- Extra weight in car

If we are testing gasoline, what variables must be kept identical?

- The cars must be of the same type.
- Each car must have the same amount of gasoline.
- The cars must be driven over the same course, at the same speed, and under the same weather conditions.
- The cars must contain the same type of tires.
- The only difference is the type of gasoline.

Conduct the Experiment identical?

- Conduct the experiment several times.
- This is important to rule out making mistakes by using too few trials.
- The more trials the more specific the data.

Analysis of Data identical?

- Examine the data and analyze it making a determination as to what it is saying.
- Check to see if your data is complete or if more tests need to be conducted.

Form a Conclusion identical?

- Apply your analyzed data to your “If- then” statement (hypothesis).
- If it satisfies the statement, then your hypothesis is correct.
- If not, then you need to reexamine your data and find out why.
- Make sure the experiment can be reproduced producing the same results.

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