Which term is the difference between the upper and lower quartiles?

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Multiple Choice

Which term is the difference between the upper and lower quartiles?

Explanation:
Inter-quartile range is the difference between the upper and lower quartiles. By definition, Q1 is the value below which 25% of data fall and Q3 is the value below which 75% fall, so IQR = Q3 − Q1. This measures the spread of the middle 50% of observations and is less affected by outliers than the overall range. The other terms don’t fit because a normal distribution describes a data pattern, a Z-score standardizes a value, and quartiles are the cut-points themselves rather than their span.

Inter-quartile range is the difference between the upper and lower quartiles. By definition, Q1 is the value below which 25% of data fall and Q3 is the value below which 75% fall, so IQR = Q3 − Q1. This measures the spread of the middle 50% of observations and is less affected by outliers than the overall range. The other terms don’t fit because a normal distribution describes a data pattern, a Z-score standardizes a value, and quartiles are the cut-points themselves rather than their span.

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