Alg2/Trig - Lesson 7-1 Types of Statistical Studies

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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. It is used to identify correlations or patterns.

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What is a survey?

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A survey is a method of collecting data by asking people questions to gather information about their opinions, behaviors, or characteristics.

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What is an experiment in statistical studies?

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An experiment is a study in which the researcher manipulates one or more variables to determine their effect on a dependent variable, allowing for cause-and-effect conclusions.

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What is a census?

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A census is a complete count of a population, where data is collected from every individual in that population.

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What is a sample survey?

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A sample survey is a method of collecting data from a subset of a population to make inferences about the entire population.

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What is the difference between a sample and a census?

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A sample collects data from a portion of the population, while a census collects data from every member of the population.

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What is the purpose of conducting an observational study?

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The purpose is to gather information about subjects in their natural environment without interference, allowing researchers to identify trends and relationships.

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What are the advantages of using surveys?

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Surveys can reach a large number of respondents quickly, are cost-effective, and can provide quantitative data for analysis.

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What are the limitations of observational studies?

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Observational studies cannot establish causation, may be subject to bias, and can be influenced by confounding variables.

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What is a key characteristic of an experiment?

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A key characteristic of an experiment is the manipulation of one or more independent variables to observe the effect on a dependent variable.