Introduction to Biology Day 21.Attendance2.Example experiment3.Design your own

Scientific Method Terms:• Control: Experimental Setup that does not change

• Experiment: a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.

• Hypothesis: An educated guess or prediction

• Variable: A characteristic of an experiment that can be changed

• Constant: A characteristic of an experiment that remains the same

• Independent Variable: The characteristic that the experimenter controls

• Dependent Variable: The characteristic that experimenter measures afterwards.

Example Bubble Lab:

Question: Does the temperature of the room effect the average size of the bubbles?

Prediction: If bubbles are blown in warmer rooms, they will be larger in size on average.

Experiment:

1. Pour a small amount ~5mL of 100% bubble solution onto the top of a lab table in a cold room.

2. Dip the end of a straw into the same solution, and place one end of the straw in the puddle of bubble solution

3. Blow gently and slowly, making the bubble larger until it pops.4. Measure the ring of the bubble. 5. Repeat in a medium temperature and warm room.6. Record data, average the trials, and graph.

Analysis: (Make a graph here, and explain it)

Bubbles blown in cold rooms reached an average size of 17cm, in medium rooms 21cm, and in warm room 15cm.

Conclusion (does this match your prediction?)

Our prediction that warmer rooms would produce larger bubbles was not supported by our data.

Cold Medium Warm

Trial 1 17cm 20cm 15cm

Trial 2 18cm 21cm 14cm

Trial 3 16cm 22cm 16cm

Average 17cm 21cm 15cm

Data

1. Question2. What are your: Control, Hypothesis, Variable, Constant(s), Independent

Variable, Dependent Variable3. Experimental Design (needs to be clear enough for anyone to follow)

1. Step 12. Step 23. Step 34. Step 45. Step 5

4. Data (organized into a table)5. Analysis (Graph and explanation of graph)6. Conclusion (do your results match your hypothesis? Why do you think

that is?)

Everything needs to be written using complete sentences

Will be turned in for a grade – so make it neat, orderly, and legible.All group members names need to be on it.

I will return your write-up tomorrow – we will make posters showing your results from

the day 1 experiment and your own experiment then.

PosterDay 1 Experiment1. Question2. Hypothesis3. Experimental Design steps4. Data/Results

5. Analysis/Graph

6. Conclusion

Your Experiment1. Question2. Hypothesis3. Experimental Design steps4. Data/Results

5. Analysis/Graph

6. Conclusion

1 2 3 40

2

4

6Chart Title

ColdMedium Warm

Axis

Title

1 2 3 Ave.0123456

Different % Bubble Solution

40%

60%

80%

100%Bubb

le w

idth

in cm

Day 3, 9/5/2013

1. Attendance2. Carry out your own experiment3. Record Data4. Complete your posters

PosterDay 1 Experiment1. Question2. Hypothesis3. Experimental Design steps4. Data/Results

5. Analysis/Graph

6. Conclusion

Your Experiment1. Question2. Hypothesis3. Experimental Design steps4. Data/Results

5. Analysis/Graph

6. Conclusion

1 2 3 40

2

4

6Chart Title

ColdMedium Warm

Axis

Title

1 2 3 Ave.0123456

Different % Bubble Solution

40%

60%

80%

100%Bubb

le w

idth

in cm