Intro to Statistics

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What is a categorical variable?

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A categorical variable is a type of variable that can take on one of a limited, and usually fixed, number of possible values, assigning each individual or other unit of observation to a particular group or nominal category on the basis of some qualitative property.

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What is a quantitative variable?

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A quantitative variable is a type of variable that can be measured numerically and can be used in mathematical calculations. It represents a measurable quantity.

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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. It is selected to gather insights about the population without surveying every individual.

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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. It includes all members of a specified group.

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What does margin of error mean?

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Margin of error is a statistic expressing the amount of random sampling error in a survey's results. It represents the range within which the true value is expected to fall.

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What is the purpose of a survey?

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The purpose of a survey is to collect data from a group of individuals to understand their opinions, behaviors, or characteristics.

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What is the difference between a sample and a population?

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A sample is a smaller group selected from a population, while a population includes all individuals or items of interest.

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What is a biased sample?

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

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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, reducing bias.

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What is a survey's response rate?

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The response rate is the percentage of people who respond to a survey out of the total number of people surveyed.