Measures of Center & Variability

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What is the definition of the Mean in statistics?

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The Mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

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What is the definition of the Median in statistics?

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The Median is the middle value of a data set when the numbers are arranged in 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 definition of the Mode in statistics?

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The Mode is the value that appears most frequently in a data set.

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What is the definition of Range in statistics?

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The Range is the difference between the highest and lowest values in a data set.

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What is the definition of Interquartile Range (IQR)?

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

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How do you calculate the Mean of a data set?

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To calculate the Mean, add all the numbers in the data set and divide by the total number of values.

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How do you find the Median of a data set?

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To find the Median, arrange the data in ascending order and identify the middle value.

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What is the formula for calculating the Range?

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Range = Maximum value - Minimum value.

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What is the process to find the IQR?

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1. Arrange the data in ascending order. 2. Find Q1 (the median of the first half) and Q3 (the median of the second half). 3. IQR = Q3 - Q1.

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What is a Stem-and-Leaf plot?

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A Stem-and-Leaf plot is a method of displaying quantitative data in a graphical format, similar to a histogram, to retain the original data values.