NC Math 3 Final Exam Review

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What is the mean of a normally distributed set of test scores if a score of 76 is 3 standard deviations below the mean and a score of 88 is 1 standard deviation above the mean?

Back

The mean is 85.

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Back

The solution is x = 0.195.

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Back

The solution set is {-4, 3, 5}.

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What is stratified sampling in research?

Back

Stratified sampling involves dividing a population into subgroups (strata) and randomly selecting samples from each stratum to ensure representation.

Front

What is the formula for the mean of a data set?

Back

The mean is calculated as the sum of all data points divided by the number of data points.

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What does it mean for a distribution to be normally distributed?

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A normally distributed data set has a symmetric bell-shaped curve where most of the observations cluster around the central peak.

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What is the significance of standard deviation in a data set?

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Standard deviation measures the amount of variation or dispersion in a set of values.

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What is the absolute value function?

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The absolute value function, denoted as |x|, returns the non-negative value of x, regardless of its sign.

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How do you determine the vertex of a quadratic function?

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Front

What is the difference between a population and a sample in statistics?

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A population includes all members of a specified group, while a sample is a subset of the population used for analysis.