Central Tendency

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What is Central Tendency?

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Central tendency is a statistical measure that identifies a single value as representative of an entire dataset. It includes measures like mean, median, and mode.

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How do you calculate the mean of a dataset?

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To calculate the mean, add all the numbers in the dataset together and then divide by the total number of values.

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What is the median?

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The median is the middle value in a dataset when the numbers are arranged in ascending order. If there is an even number of values, the median is the average of the two middle numbers.

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What is the mode?

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

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What is the interquartile range (IQR)?

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The interquartile range is a measure of statistical dispersion, calculated as the difference between the third quartile (Q3) and the first quartile (Q1). It represents the range of the middle 50% of the data.

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How do you find the first quartile (Q1)?

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To find Q1, arrange the data in ascending order and find the median of the lower half of the dataset.

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How do you find the third quartile (Q3)?

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To find Q3, arrange the data in ascending order and find the median of the upper half of the dataset.

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What is a bar graph?

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A bar graph is a visual representation of data using bars of different heights or lengths to compare different categories.

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What is a histogram?

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A histogram is a type of bar graph that represents the frequency distribution of numerical data, where the bars touch each other.

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What is a frequency polygon?

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A frequency polygon is a graphical representation of a frequency distribution, created by connecting the midpoints of the top of the bars of a histogram with straight lines.