A2 Probability & Statistics Review

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What is a Controlled Experiment?

Back

A controlled experiment is a scientific test where one variable is changed while all others are kept constant to determine the effect of that variable.

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What is an Observational Study?

Back

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 in statistics?

Back

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

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What is a Population in statistics?

Back

A population is the entire group of individuals or instances about whom we hope to learn.

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What is Sampling Bias?

Back

Sampling bias occurs when the sample is not representative of the population, leading to inaccurate results.

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What is the importance of Random Sampling?

Back

Random sampling ensures that every individual has an equal chance of being selected, which helps to eliminate bias.

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What is a Survey?

Back

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

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What is a Sample Space in probability?

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The sample space is the set of all possible outcomes of a probability experiment.

Front

What are the possible outcomes when flipping two coins?

Back

HH, HT, TH, TT.

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What is a Systematic Sample?

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A systematic sample is obtained by selecting every nth individual from a population.