Math 3 HW8 Statistics

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What is the margin of error in a survey?

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The margin of error is a statistic that expresses the amount of random sampling error in a survey's results. It indicates the range within which the true value is likely to fall.

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How do you calculate a confidence interval using a percentage and margin of error?

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To calculate a confidence interval, subtract the margin of error from the percentage to find the lower limit and add the margin of error to the percentage to find the upper limit.

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What is a cluster sampling technique?

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Cluster sampling is a sampling technique where the population is divided into groups (clusters), and entire clusters are randomly selected to be included in the sample.

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What is a parameter in statistics?

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A parameter is a numerical value that summarizes a characteristic of a population, such as the population mean or population proportion.

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What is an outlier in a data set?

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An outlier is a data point that differs significantly from other observations in the data set, often due to variability in the measurement or it may indicate a measurement error.

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How do you identify outliers using the Interquartile Range (IQR)?

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Outliers are identified by finding values that are 1.5 times the IQR below Q1 or above Q3.

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What is the difference between a sample and a population?

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A population includes all members of a specified group, while a sample is a subset of the population used to represent the whole.

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What is the purpose of conducting a survey?

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The purpose of conducting a survey is to gather data and insights from a specific group to make inferences about a larger population.

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What does it mean for a survey to be random?

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A random survey means that every individual in the population has an equal chance of being selected, which helps to eliminate bias.

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What is the significance of a confidence level in statistics?

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The confidence level indicates the probability that the confidence interval contains the true population parameter.