Standard deviation (AQA GCSE Statistics): Flashcards
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What does a small standard deviation indicate?
What does a small standard deviation indicate?
Values cluster close to the mean.
How do you calculate individual deviation?
How do you calculate individual deviation?
Use (x - mean) for each data point.
What is the formula for standard deviation (Method 1)?
What is the formula for standard deviation (Method 1)?
SD = √(1/n * Σ(x - mean)²)
What is the first step in calculating SD?
What is the first step in calculating SD?
Calculate the mean of the data set.
How do you find the squared deviations?
How do you find the squared deviations?
Square each individual deviation from the mean.
What is the second method for calculating SD?
What is the second method for calculating SD?
Use SD = √(Σx²/n - (mean)²)
What common mistake to avoid in SD calculations?
What common mistake to avoid in SD calculations?
Forget to take the square root at the end.
What should you check about your SD answer?
What should you check about your SD answer?
It should be positive and reasonable.
What does a large standard deviation indicate?
What does a large standard deviation indicate?
Values are widely dispersed from the mean.
Why is showing all working important in exams?
Why is showing all working important in exams?
Examiners want to see each calculation step.