Chapter 9 Review: Random Sampling and Bias

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What is random sampling?

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Random sampling is a technique used to select a subset of individuals from a larger population, where each individual has an equal chance of being chosen.

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What is bias in survey questions?

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Bias in survey questions occurs when the wording or structure of the question leads respondents to a particular answer, thus skewing the results.

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Define population in statistics.

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In statistics, a population refers to the entire group of individuals or instances about whom we hope to learn.

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What is a sample in statistics?

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A sample is a subset of a population that is used to represent the entire group in statistical analysis.

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What is the independent variable in an experiment?

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The independent variable is the factor that is manipulated or changed in an experiment to observe its effect on the dependent variable.

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What is a biased question?

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A biased question is one that is phrased in a way that influences the respondent's answer, often leading to skewed results.

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What is the difference between a statistic and a parameter?

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A statistic is a numerical value that describes a sample, while a parameter is a numerical value that describes a population.

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What does it mean for a sample to be representative?

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A representative sample accurately reflects the characteristics of the population from which it is drawn.

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What is a census?

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A census is a survey that attempts to collect data from every member of a population.

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What is the purpose of random sampling?

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The purpose of random sampling is to obtain a sample that is unbiased and representative of the population, allowing for valid conclusions.