1. Section 1-2 How Scientists Work=

2. Designing an Experiment
State the Problem
Analyze Results
Form a Hypothesis
Draw a Conclusion
Set Up a Controlled Experiment
Publish Results
Record Results
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3. Stating the Problem
Maggots, mice and beetles just appearing on meat, rice and grain
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4. Forming a Hypothesis Spontaneous generation
Francesco Redi – proposed maggots most likely came from flies laying eggs to small for people to see
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5. Setting up a Controlled Experiement
Redi’s Experiment
Section 1-2
OBSERVATIONS: Flies land on meat that is left uncovered. Later, maggots appear on the meat.
HYPOTHESIS: Flies produce maggots.
PROCEDURE
Uncovered jars
Covered jars
Controlled Variables:
jars, type of meat,
location, temperature,
time
Several
days pass
Manipulated Variables:
gauze covering that
keeps flies away from
meat
Responding Variable:
whether maggots
appear
Maggots appear
No maggots appear
CONCLUSION: Maggots form only when flies come in contact with meat. Spontaneous generation of maggots did not occur.
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6. Results and Conclusions
Scientists record everything that they do in an experiment so it can be repeated
Scientists use the data from an experiment to evaluate the hypothesis and draw a conclusion
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