Transforming data (Edexcel GCSE Statistics): Flashcards
📚Flashcards
Practise the cards
9 cards from this deck
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Practise the cards
9 cards from this deck
Example: Find the mean of prices £45, £28, £36, £57, £28?
Example: Find the mean of prices £45, £28, £36, £57, £28?
Transform, compute, then reverse to find original mean.
How to transform data for easier calculation?
How to transform data for easier calculation?
Add/subtract or multiply/divide all data values by same amount.
If all data is increased by 10%, what multiplier is used?
If all data is increased by 10%, what multiplier is used?
Multiply by 1.1 to account for 10% increase.
What should you do after calculating the mean of transformed data?
What should you do after calculating the mean of transformed data?
Reverse the transformation (divide or subtract) to find original mean.
What affect does multiplying all data by 3 have on measures of center?
What affect does multiplying all data by 3 have on measures of center?
Mean, median, mode are all multiplied by 3.
What is the effect of a 20% increase on data?
What is the effect of a 20% increase on data?
Multiply data by 1.2 to include the increase.
How does a 15% decrease affect data?
How does a 15% decrease affect data?
Multiply by 0.85 (which is 100% - 15%).
Prices 2.05,2.02,2.14,2.01,2.20,2.09. Subtract 2 then ×100 mean?
Prices 2.05,2.02,2.14,2.01,2.20,2.09. Subtract 2 then ×100 mean?
Mean = 2.085
Mean of 59,52,56.5,59.5,58 via transform?
Mean of 59,52,56.5,59.5,58 via transform?
57 s (transform: -50,×10 → mean70 → ÷10,+50)