Measures of dispersion for discrete data (Edexcel GCSE Statistics): Flashcards
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What is the main purpose of measures of dispersion?
What is the main purpose of measures of dispersion?
To understand how spread out data values are.
What are the two main measures of dispersion for discrete data?
What are the two main measures of dispersion for discrete data?
Range and interquartile range (IQR).
How does the range measure data spread?
How does the range measure data spread?
Largest value minus smallest value.
How is the interquartile range (IQR) calculated?
How is the interquartile range (IQR) calculated?
Q₃ minus Q₁, the spread of middle 50%.
What do quartiles divide the data into?
What do quartiles divide the data into?
Four equal parts or quarters.
What is Q₁ in data analysis?
What is Q₁ in data analysis?
Lower quartile, 25% of data below this.
What is the first step before finding quartiles?
What is the first step before finding quartiles?
Arrange data in ascending order.
How does the IQR help when data has outliers?
How does the IQR help when data has outliers?
Focuses on middle 50%, less affected by outliers.
What is the key to correctly calculating quartiles?
What is the key to correctly calculating quartiles?
Arrange data in ascending order first.
What is a disadvantage of using the range?
What is a disadvantage of using the range?
Affected by extreme values (outliers).