Types of Statistical Studies

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What is an Experiment in statistical studies?

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An Experiment is a research method where the researcher manipulates one or more variables to observe the effect on another variable, often involving random assignment to groups.

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What is an Observational Study?

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An Observational Study is a research method where the researcher observes and records behavior without manipulating any variables.

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What is a Census?

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A Census is a research method that involves collecting data from every member of a population.

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What is a Sample Survey?

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A Sample Survey is a research method that involves collecting data from a subset of a population to make inferences about the whole population.

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What is the purpose of random assignment in experiments?

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Random assignment helps ensure that each participant has an equal chance of being assigned to any group, reducing bias and increasing the validity of the results.

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What is the difference between a Sample Survey and a Census?

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A Sample Survey collects data from a subset of the population, while a Census collects data from every member of the population.

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What is the significance of control groups in experiments?

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Control groups are used in experiments to provide a baseline for comparison, helping to isolate the effect of the independent variable.

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What is a variable in the context of statistical studies?

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A variable is any characteristic, number, or quantity that can be measured or counted, and can vary among subjects in a study.

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What is the role of hypothesis testing in statistical studies?

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Hypothesis testing is a method used to determine if there is enough evidence to reject a null hypothesis, based on sample data.

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What is correlation in statistical studies?

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Correlation is a statistical measure that describes the extent to which two variables change together, but does not imply causation.