Nature of Science/Scientific Method

The steps to a scientific method are:

• make an observation, design a controlled experiment, form a hypothesis, analyze data, and then draw a conclusion

• Test a theory, analyze data, and then draw a conclusion

• Make an observation, form a hypothesis, design a controlled experiment, analyze data and form a conclusion

• form a hypothesis, analyze data and then make a theory

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The variable that the scientist physically changes is called

• the dependent variable

• variables

• the control variable

• the independent variable

If you do not understand a direction or part of a lab procedure, you should;

• try several methods until something works

• skip it and go onto the next part

• figure it out as you go along

• ask the instructor for clarification before proceeding

Quantitative data is

• data that is measured (numerical)

• data that is descriptive (adjectives)

• data that cannot be used

• data that is skewed (out of range)

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which component is missing from Carmen's Experiment?

• observations

• a hypothesis

• a control group

• a description of the experiment

the graph shows atmospheric carbon dioxide levels since the year 1880.

Which of the following conclusions can be drawn from this graph?

• atmospheric carbon dioxide levels are solely responsible for global temperature change

• atmospheric carbon dioxide levels have been rising at about the same rate for the past century

• atmospheric carbon dioxide levels have remained the same over the past century

• atmospheric carbon dioxide levels have been rising at an increasingly higher rate as the past century has progressed

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A scientist performs an experiment to see if acids have an effect on the health of a particular type of plant. Three sets of plants were treated with acidic solutions of a known pH while the control.

Remember: (0 - highest acidity / 7 = neutral / 14 - highest alkalinity)

Using the picture, what is the best conclusion for this experiment?

• Acid has no effect on the health of this type of plant

• High acidity is helpful to this type of plant

• Low acidity is harmful to this type of plant

• High acidity is harmful to this type of plant

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Which is NOT a step in the scientific method?

• Make observation
• Form a theory
• Collect data
• Form a hypothesis

Dependent variable means

• the scientist controls what to test
• educated guess
• ask a question
• what is being measured

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What is an inference?

•  An inference is something that you think is true based on information that you have.
• An inference is directly written in the text

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