experimental design

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What is a controlled experiment?

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A controlled experiment is one where the experimenter changes only one variable.

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Why should scientific experiments be repeated?

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To ensure that the data is accurate and reliable.

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What is qualitative data?

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Data that is recorded as observations, often descriptive in nature.

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What is a hypothesis?

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An if/then/because statement that shows a cause & effect relationship.

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What is the independent variable in an experiment?

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The variable that is changed or controlled in a scientific experiment to test its effects.

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What is the dependent variable in an experiment?

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The variable that is measured and affected in the experiment.

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What is the purpose of a control group?

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To provide a standard for comparison against the experimental group.

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What does it mean to have a variable in an experiment?

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A variable is any factor, trait, or condition that can exist in differing amounts or types.

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What is the difference between quantitative and qualitative data?

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Quantitative data is numerical and can be measured, while qualitative data is descriptive and based on observations.

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What is the significance of a sample size in an experiment?

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A larger sample size can lead to more reliable and valid results.