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Flip to reveal answersHow do you find the median of an ordered list?
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All 9 Flashcards — Quartiles & IQR
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Question
How do you find the median of an ordered list?
Answer
It is the middle value (for odd n) or the mean of the two middle values (for even n).
Question
What is the lower quartile Q1?
Answer
The median of the lower half of the ordered data.
Question
What is the upper quartile Q3?
Answer
The median of the upper half of the ordered data.
Question
For odd n, do you include the median in the halves?
Answer
No — leave the median out of both halves before finding the quartiles.
Question
What is the range?
Answer
Maximum − minimum.
Question
What is the interquartile range?
Answer
IQR = Q3 − Q1, the spread of the middle 50%.
Question
Why is the IQR preferred to the range when there are outliers?
Answer
The IQR uses only the quartiles, so extreme values barely change it.
Question
For an even number of values, what is the median?
Answer
The mean of the two middle values.
Question
On Paper 2, how do you get the quartiles quickly?
Answer
Enter the data in a list and run 1-Var Stats — it lists Q1, Med and Q3.
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Full study notes for Quartiles & IQR
Topic 4.3 hub
Central tendency & spread
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Math AA SL exam skills
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