AP Biology: Experimental Design

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What is the null hypothesis?

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The hypothesis that there is no significant difference between treatments, any observed difference being due to chance.

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What is a control strain in an experiment?

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A group that does not receive the experimental treatment, used for comparison.

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What is a dependent variable?

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The variable being tested and measured in an experiment.

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What is an independent variable?

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The variable that is manipulated or changed in an experiment.

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What is the purpose of a control group?

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To provide a baseline for comparison against the treatment group.

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What does it mean to reject the null hypothesis?

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It means that the results of the experiment show a significant difference between the treatment and control groups.

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What is an experimental treatment?

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The specific condition or intervention applied to the experimental group.

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What is replication in an experiment?

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Repeating an experiment to ensure that the results are consistent and reliable.

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What is a variable in an experiment?

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Any factor, trait, or condition that can exist in differing amounts or types.

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What is the significance of sample size in an experiment?

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A larger sample size increases the reliability and validity of the results.