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.

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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 take on an infinite number of values within a given range.

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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 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 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, indicating the range within which the true value lies.

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How do you calculate the range using margin of error?

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To calculate the range using margin of error, subtract the margin of error from the estimate to find the lower limit and add the margin of error to the estimate to find the upper limit.

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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 to gather information about 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 members of a specified group.

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What is the purpose of using a sample in statistics?

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The purpose of using a sample is to make inferences about the population without having to collect data from every individual.

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What does it mean if a statistic describes a sample?

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If a statistic describes a sample, it provides information about that specific subset of the population, which can be used to estimate characteristics of the entire population.