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8 Cards in this Set
- Front
- Back
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Repeating tests usually leads to
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more confidence in the results.
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Tim makes a volcano demonstration for a class. He makes a clay volcano and then pours vinegar into the baking soda that is inside of the volcano. What could Tim do to make this demonstration into an experiment?
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He could compare adding different amounts of vinegar to the same amount of baking soda and time how long it bubbles. He is answering the question “What is the effect of increasing the amount of vinegar on the amount of bubbles that are produced?”
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In an experiment to test a new drug’s effectiveness, one group is given a larger dosage than is typically prescribed, and a second group is given a smaller dosage than is typically prescribed. Then, the results of the groups are compared to each other. What is missing from this scientific design?
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control group
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Choose the best scientific design to test the question “Which soil type results in the highest yield of tomatoes: clay soil or sandy soil?”
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Compare the average number of tomatoes that are produced by 10 tomato plants that are grown in clay soil to the average number of tomatoes that are produced by 10 tomato plants that are grown in sandy soil.
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To test the effectiveness of a new drug, one group is given the new pills, and the other group is not given anything. Then, researchers compare the two groups. What is the flaw with this scientific design?
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The control group should still take a pill to keep the conditions as similar as possible
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Amy was observing the growth of five kinds of flowering plants on a windowsill. She noticed that some of the flowers on some of the plants turned toward the sun during the day, but the flowers on other plants did not turn toward the sun. She asked the following question.
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It is too broad.
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Which question could be tested in a scientific manner?
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What causes some people to be colorblind?
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What is another term for the responding variable?
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dependent variable
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