Types of Statistical Studies

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What is a biased sample?

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A biased sample is one that does not accurately represent the population from which it is drawn, leading to skewed results.

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What is an unbiased sample?

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An unbiased sample is one that accurately represents the population, allowing for valid conclusions to be drawn.

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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.

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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 sample survey?

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A sample survey is a method of collecting data by asking a subset of individuals from a larger population.

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What is a census in statistical studies?

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A census is a method of collecting data from every individual in the 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.

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What is the difference between an experiment and an observational study?

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An experiment involves manipulation of variables, while an observational study involves only observation without manipulation.

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What is the significance of control groups in experiments?

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Control groups are used to compare against experimental groups to determine the effect of the treatment.

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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.