L50A2 Population and Sampling HW

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What is an observational study?

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An observational study is a type of research where the researcher observes and records behavior or outcomes without manipulating any variables. The subjects are not influenced by the researcher.

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What is an experiment?

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An experiment is a research method where the researcher manipulates one or more variables to determine their effect on another variable, allowing for cause-and-effect conclusions.

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What is a sample in research?

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A sample is a subset of a population selected for observation and analysis, used to make inferences about the larger group.

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What is the difference between a sample and a population?

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A population includes all members of a defined group, while a sample is a smaller group selected from that population for study.

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What does it mean for a study to be randomized?

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Randomization means that participants are assigned to different groups in a study by chance, reducing bias and ensuring that each group is similar.

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What is the purpose of a control group in an experiment?

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A control group is used as a baseline to compare against the experimental group, helping to isolate the effect of the independent variable.

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What is a variable in research?

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A variable is any factor, trait, or condition that can exist in differing amounts or types and can affect the outcome of a study.

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What is a dependent variable?

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The dependent variable is the outcome or response that is measured in an experiment, which is affected by changes in the independent variable.

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What is an independent variable?

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The independent variable is the factor that is manipulated or changed in an experiment to observe its effect on the dependent variable.

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What does it mean for a study to be blind?

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A blind study is one in which participants do not know whether they are in the experimental or control group, reducing bias in their responses.