Sci Methods Ch1.2 7th
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- Pages: 14
Chapter 1 Section 2
Students will be able to: ◦ Describe the scientific method ◦ Determine the appropriate design of a controlled experiment ◦ Form a hypothesis; Write prediction statements ◦ Use information in tables and graphs to analyze experimental results
Series of steps followed to solve problems
Do you know what the steps are?
Take a minute to write down the steps as you know them…
Ask a question Form a hypothesis Test the hypothesis Analyze the results Draw conclusions Communicate results
“Could something in the water be causing the frog deformities?”
Make observation ◦ Gather information through your senses ◦ Accurately make and record your observations
Hypothesis: a possible explanation or answer to a question
Based on your observations
Can be tested
Predictions : statement of cause and effect that can be used to set up a test for a hypothesis (if-then format)
Figure 5 pg. 13 examples:
Consider these questions: ◦ Is an unknown liquid water or rubbing alcohol? ◦ Can plants sense which way is up? ◦ Do cardinals prefer sunflower seeds to millet?
Controlled experiments: tests only one factor at a time; a control group and 1 or more experimental groups.
Only one factor differs, this is the variable
Designing an experiment
Collecting data
Turn to pages 14-15, table 1 & figure 7 in your text
Which of the aquariums shown are part of the control group, and which are experimental?
If it was not labeled, how could you tell which group was the control group?
Other than the variable, what differences are there between the groups?
What steps should be taken before the eggs in Fig. 7 are put in the aquariums?
How might the experiment be compromised (affected) if the environments varied in any way?
Organize your data (tables, graphs, etc.)
Helps to explain and focus on effects of the variable
Do the results of the experiment support the hypothesis?
If not, need to find another explanation…
Problems are rarely solved with just one experiment
Share with others to learn more and expand your ideas
Compare hypotheses
Repeat experiments
Develop new experiments and hypotheses
Why is it important to have a control group when doing an experiment?
Why should a hypothesis be testable?
Students will be able to: ◦ Describe the scientific method ◦ Determine the appropriate design of a controlled experiment ◦ Form a hypothesis; Write prediction statements ◦ Use information in tables and graphs to analyze experimental results
Series of steps followed to solve problems
Do you know what the steps are?
Take a minute to write down the steps as you know them…
Ask a question Form a hypothesis Test the hypothesis Analyze the results Draw conclusions Communicate results
“Could something in the water be causing the frog deformities?”
Make observation ◦ Gather information through your senses ◦ Accurately make and record your observations
Hypothesis: a possible explanation or answer to a question
Based on your observations
Can be tested
Predictions : statement of cause and effect that can be used to set up a test for a hypothesis (if-then format)
Figure 5 pg. 13 examples:
Consider these questions: ◦ Is an unknown liquid water or rubbing alcohol? ◦ Can plants sense which way is up? ◦ Do cardinals prefer sunflower seeds to millet?
Controlled experiments: tests only one factor at a time; a control group and 1 or more experimental groups.
Only one factor differs, this is the variable
Designing an experiment
Collecting data
Turn to pages 14-15, table 1 & figure 7 in your text
Which of the aquariums shown are part of the control group, and which are experimental?
If it was not labeled, how could you tell which group was the control group?
Other than the variable, what differences are there between the groups?
What steps should be taken before the eggs in Fig. 7 are put in the aquariums?
How might the experiment be compromised (affected) if the environments varied in any way?
Organize your data (tables, graphs, etc.)
Helps to explain and focus on effects of the variable
Do the results of the experiment support the hypothesis?
If not, need to find another explanation…
Problems are rarely solved with just one experiment
Share with others to learn more and expand your ideas
Compare hypotheses
Repeat experiments
Develop new experiments and hypotheses
Why is it important to have a control group when doing an experiment?
Why should a hypothesis be testable?
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