Transforming data (AQA GCSE Statistics): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
ShowHide
Practise the cards
10 cards from this deck
What does data transformation involve in statistics?
What does data transformation involve in statistics?
Applying a consistent operation to all dataset values.
How does transformation affect mean, median, mode?
How does transformation affect mean, median, mode?
All averages change in the same way as data values.
Transform 2.05, 2.02, 2.14 by subtracting 2.
Transform 2.05, 2.02, 2.14 by subtracting 2.
Transformed values: 0.05, 0.02, 0.14.
What is the mean of the values: 5, 2, 14, 1, 20, 9?
What is the mean of the values: 5, 2, 14, 1, 20, 9?
Mean = 8.5 (sum = 51, count = 6, 51/6 = 8.5)
What multiplier for a 20% increase in data?
What multiplier for a 20% increase in data?
Multiply by 1.2 for a 20% increase.
New mean if £38.80 increases by 20%?
New mean if £38.80 increases by 20%?
New mean = £38.80 × 1.2 = £46.56.
How to reverse a transformation of subtracting 10?
How to reverse a transformation of subtracting 10?
Add 10 back to the final result.
What to multiply for a 15% increase?
What to multiply for a 15% increase?
Multiply by 1.15 for a 15% increase.
Why transform data for large datasets?
Why transform data for large datasets?
It simplifies calculations significantly.
What is a common mistake in data transformation?
What is a common mistake in data transformation?
Forgetting to reverse the transformation.