Data & Sampling Practice

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What is a sample in statistics?

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A sample is a subset of a population used to represent the entire group.

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What is the difference between a biased sample and an unbiased sample?

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A biased sample does not accurately represent the population, while an unbiased sample does.

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What is a population in statistics?

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

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What does it mean to survey a group?

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To survey a group means to collect data or opinions from a selected sample of individuals.

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What is random sampling?

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

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Why is it important to have an unbiased sample?

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An unbiased sample ensures that the results of the survey or study can be generalized to the entire population.

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What is sample size?

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Sample size refers to the number of observations or data points collected in a sample.

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How can you determine if a sample is biased?

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A sample is biased if certain groups are overrepresented or underrepresented compared to the population.

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What is convenience sampling?

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Convenience sampling is a non-random sampling technique where subjects are selected based on their easy availability.

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What is stratified sampling?

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Stratified sampling involves dividing the population into subgroups and randomly sampling from each subgroup.