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Flip to reveal answersWhat does the standard deviation measure?
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All 9 Flashcards — Standard deviation
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Question
What does the standard deviation measure?
Answer
How far values typically lie from the mean — the spread of the data.
Question
What does a small standard deviation tell you?
Answer
The data is clustered close to the mean.
Question
What is the variance?
Answer
The standard deviation squared (σ²).
Question
How do you find the standard deviation on Paper 2?
Answer
Enter the data in a list and run 1-Var Stats; read σx.
Question
Which output is the standard deviation: σx or Sx?
Answer
σx — the population standard deviation used in the IB syllabus.
Question
How do you enter a frequency table for 1-Var Stats?
Answer
Values in one list, frequencies in another, then run 1-Var Stats with both lists.
Question
If you add c to every value, what happens to the mean and σ?
Answer
The mean increases by c; the standard deviation is unchanged.
Question
If you multiply every value by k, what happens to the mean and σ?
Answer
Both are multiplied by |k|.
Question
How do you get σ from the variance?
Answer
Take the square root: σ = √variance.
Read the notes
Full study notes for Standard deviation
Topic 4.3 hub
Central tendency & spread
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Math AA SL exam skills
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