Statistics

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What is standard deviation?

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Standard deviation is a measure of the amount of variation or dispersion in a set of values. A low standard deviation indicates that the values tend to be close to the mean, while a high standard deviation indicates that the values are spread out over a wider range.

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How do you calculate standard deviation?

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1. Find the mean of the data set. 2. Subtract the mean from each data point and square the result. 3. Find the average of these squared differences. 4. Take the square root of that average.

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What is an outlier?

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An outlier is a data point that differs significantly from other observations in a dataset. It can be much higher or lower than the rest of the data.

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How do you identify an outlier in a dataset?

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Outliers can be identified using methods such as the interquartile range (IQR) method, where any data point that lies below Q1 - 1.5*IQR or above Q3 + 1.5*IQR is considered an outlier.

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What is the mean of a dataset?

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The mean is the average of a set of numbers, calculated by adding all the numbers together and dividing by the count of numbers.

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How do you calculate the mean?

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1. Add all the numbers in the dataset. 2. Divide the sum by the total number of values.

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What is mode in statistics?

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The mode is the value that appears most frequently in a data set. A dataset may have one mode, more than one mode, or no mode at all.

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How do you find the mode of a dataset?

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To find the mode, count how many times each value appears in the dataset. The value(s) that appear most frequently is the mode.

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What is a convenience sample?

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A convenience sample is a type of non-probability sampling where the sample is taken from a group of people easy to reach.

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What is a random sample?

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A random sample is a subset of individuals chosen from a larger set, where each individual has an equal chance of being selected.