Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 7 - No. 24)
Which statement is correct regarding outliers in a data set?
Outliers are always a sign of an error in data collection.
Outliers always increase the value of the range.
Outliers always decrease the value of the range.
Outliers can significantly impact the mean.
Explanation
Outliers impact the mean because all values influence it.
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