Samples and Populations

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What is a population in statistics?

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A population is the entire group of individuals or items that we want to study or draw conclusions about.

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What is a sample in statistics?

Back

A sample is a subset of the population that is selected for the purpose of conducting a study.

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What does it mean if a study is biased?

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A study is biased if the sample does not accurately represent the population, leading to skewed results.

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What is the median in a data set?

Back

The median is the middle value when the data set is ordered from least to greatest.

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What is the interquartile range (IQR)?

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The interquartile range (IQR) is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set, measuring the spread of the middle 50% of the data.

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What is the mean in a data set?

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The mean is the average of all the values in a data set, calculated by dividing the sum of the values by the number of values.

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What is a random sample?

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A random sample is a sample that is selected from the population in such a way that every individual has an equal chance of being chosen.

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What is a quartile?

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A quartile is a type of quantile that divides a data set into four equal parts.

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How can you determine if a sample is representative of a population?

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

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What is variability in statistics?

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Variability refers to how spread out or dispersed the values in a data set are.