A2 Statistics- Techniques to Gather Data

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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.

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What is an experiment in statistics?

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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.

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What is a sample group?

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A sample group is a subset of a population selected for observation and analysis in a study.

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What is the control group in an experiment?

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The control group is the group in an experiment that does not receive the treatment or intervention, used as a benchmark to measure the effects of the treatment.

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What is random sampling?

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Random sampling is a technique where each member of a population has an equal chance of being selected for the sample.

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What is the importance of sample size in statistical studies?

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A larger sample size generally leads to more reliable and valid results, reducing the margin of error.

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What is a variable in statistics?

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A variable is any characteristic, number, or quantity that can be measured or counted.

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What is the difference between qualitative and quantitative data?

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Qualitative data describes characteristics or qualities, while quantitative data involves numerical values that can be measured.

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What is bias in sampling?

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Bias in sampling occurs when certain members of a population are more likely to be selected than others, leading to an unrepresentative sample.

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What is a survey in statistics?

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A survey is a method of collecting data by asking questions to a group of people.