5.7 Types of Statistical Studies

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What is an experimental study?

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An experimental study is a research method where the researcher manipulates one variable and observes the effect on another variable, often involving random assignment to groups.

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What is a sample survey?

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A sample survey is a research method where a subset of a population is selected to represent the whole, allowing researchers to gather data about the population's characteristics.

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What is an observational study?

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An observational study is a research method where the researcher observes subjects in their natural environment without manipulation or intervention.

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What does biased sample mean?

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A biased sample is a sample that does not accurately represent the population, leading to skewed results.

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What is a census in research?

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A census is a research method that involves collecting data from every member of 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 placed in any group, reducing bias and increasing the validity of the results.

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How does an observational study differ from an experimental study?

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An observational study involves watching subjects without intervention, while an experimental study involves manipulating variables to observe effects.

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What is the significance of control groups in experiments?

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Control groups serve as a baseline to compare the effects of the experimental treatment, helping to isolate the impact of the independent variable.

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What is the role of hypothesis in experimental research?

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A hypothesis is a testable prediction about the relationship between variables, guiding the research design and analysis.

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What is correlation in research?

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

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