# Scientific Method Raytheon Engineers.

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Scientific Method Raytheon Engineers

Comparison Scientific Method and Engineering Design Process

Steps of the Scientific Method

Scientific Method Steps

Scientific Method Steps
Test Your Hypothesis by Doing an Experiment: Your experiment tests whether your hypothesis is true or false. It is important for your experiment to be a fair test. You conduct a fair test by making sure that you change only one factor at a time while keeping all other conditions the same. Write the experimental procedure like a step-by-step recipe for your science experiment. A good procedure is so detailed and complete that it lets someone else duplicate your experiment exactly! Repeating a science experiment is an important step to verify that your results are consistent and not just an accident. For a typical experiment, you should plan to repeat it at least three times (more is better). If you are doing something like growing plants, then you should do the experiment on at least three plants in separate pots (that's the same as doing the experiment three times). If you are doing an experiment that involves testing or surveying different groups, you won't need to repeat the experiment three times, but you will need to test or survey a sufficient number of participants to insure that your results are reliable. You will almost always need many more than three participants!

Scientific Method Steps
Analyze Your Data and Draw a Conclusion: Once your experiment is complete, you collect your measurements and analyze them to see if your hypothesis is true or false. Scientists often find that their hypothesis was false, and in such cases they will construct a new hypothesis starting the entire process of the scientific method over again. Even if they find that their hypothesis was true, they may want to test it again in a new way. Review your data. Try to look at the results of your experiment with a critical eye. Ask yourself these questions: Is it complete, or did you forget something? Do you need to collect more data? Did you make any mistakes? Calculate an average for the different trials of your experiment, if appropriate. Make sure to clearly label all tables and graphs. And, include the units of measurement (volts, inches, grams, etc.). Place your independent variable on the x-axis of your graph and the dependent variable on the y-axis.

Scientific Method Steps

Let’s Set Up the Teams Team Organization Team Name
Collaborate on the Name Team Lead Appoint 1 person

Think Fast – Material / People
metric ruler with centimeter marks table and chair paper and pen for charting results Notebook to document and out brief results People One material distributor and completed sheet runner One Ruler dropper 2 Ruler measure 2 graph readers 1 distance and time recorder 2 average calculators

Think Fast – Reaction Time Table

Think Fast – Reaction Time Graph

What is Our Hypothesis?

Think Fast -Experimental Procedure
Sit in a chair with your arm resting on a table so that your wrist hangs off the edge. Your friend should hold the ruler so that it dangles above your hand. Make sure the "zero" end of the ruler is hanging between your thumb and finger. When your friend lets go of the ruler, try to catch it between your thumb and finger as quickly as you can. Mark the ruler where you caught it (top of the thumb). This will be your first measurement, or trial #1. Write down the measurement in a data table. Trial #1 Trial #2 Trial #3 Average Reaction Time Name Age Gender R or L ruler (cm) time (s) Seconds

Think Fast -Experimental Procedure
Compare the marking on the ruler where your fingers caught it to the reaction time chart above. Write down your reaction time in the data table. Repeat steps 1–4 two more times, for trial #2 and trial #3. Did your reaction times vary a lot or were they pretty much the same from trial to trial? Calculate the average reaction time. Add together your three times and divide the answer by 3. Write the average reaction time in your data table. Repeat steps 1–6 for your friend, and any other volunteer you would like to test. Draw a bar graph to present your data. Along the left side of the graph (Y-axis) write the times from the reaction time chart. Across the bottom of the graph (X-axis) write the names of yourself and your volunteers separate columns. Draw a bar for each person up to the number that matches their average reaction time in seconds. Who has the best reaction time?

Results / Out brief / Conclusion