Day 1: An Overview of Statistics

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What is a statistic?

Back

A statistic is a numerical value that describes a characteristic of a sample, which is a subset of a population.

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What is a parameter?

Back

A parameter is a numerical value that describes a characteristic of an entire population.

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In a survey of 1503 adults, 53% said they use both a landline and a cell phone. Is this a statistic or a parameter?

Back

This is a statistic because it describes a characteristic of a sample (the 1503 adults surveyed).

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What does it mean if a parameter is defined for a population?

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It means that the value represents a characteristic of every individual in that population.

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What is the difference between a sample and a population?

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A sample is a subset of individuals selected from a larger group (population) for the purpose of statistical analysis.

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What is the significance of the percentage of all people who bought an album that thought the songs were good?

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This percentage represents a parameter because it refers to the entire population of people who bought the album.

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What is the role of surveys in statistics?

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Surveys are used to collect data from a sample to make inferences about a population.

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What is an example of a statistic in a customer experience survey?

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The percentage of customers surveyed that reported a positive experience.

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What does it mean if the average math score for all graduates on the ACT is a parameter?

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It means that the average score (21.1) represents the performance of the entire population of graduates.

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How can you identify a statistic in a research study?

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A statistic can be identified as a value derived from a sample that is used to estimate a parameter.