Transformations of data sets

Worked examples (9)

• 1Standardising a single value
• 2A value below the mean
• 3Comparing two distributions
• 4Which performance was better?
• 5From a standardised score back to the value
• 6Scaling to a given mean and standard deviation
• 7The mark that means the same in both distributions
• 8A comparison with a trade-off
• 9Showing that standardised values have mean 0 and standard deviation 1

Model answers (9)

• ✓Model answer — 0479 Paper 1 style — 6.5
• ✓Model answer — 0479 Paper 2 style — 6.5
• ✓Model answer — 0479 Paper 1 style — 6.5
• ✓Model answer — 0479 Paper 1 style — 6.6
• ✓Model answer — 0479 Paper 2 style — 6.5
• ✓Model answer — 0479 Paper 2 style — 6.5
• ✓Model answer — 0479 specimen Paper 2 Q5(b) — 6.5
• ✓Model answer — 0479 Paper 1 style — 6.6 (AO2)
• ✓Model answer — 0479 Paper 2 style — 6.5 (links to 6.1)

Worked examples (9)

• 1Adding a constant: the mean and the median
• 2Adding a constant: the spread does not move
• 3Multiplying every value by a constant
• 4The specimen's three transformed variables
• 5Naming the transformation from a summary
• 6A conversion formula in context
• 7One extra value, and one removed
• 8Three extra pupils and the new median
• 9Recovering the original summary

Model answers (9)

• ✓Model answer — 0479 specimen Paper 2 Q7 — 6.1
• ✓Model answer — 0479 specimen Paper 2 Q7 — 6.1
• ✓Model answer — 0479 Paper 1 style — 6.2
• ✓Model answer — 0479 specimen Paper 2 Q7 — 6.1
• ✓Model answer — 0479 Paper 2 style — 6.1 (AO2)
• ✓Model answer — 0479 Paper 2 style — 6.1
• ✓Model answer — 0479 Paper 1 style — 6.1
• ✓Model answer — 0479 Paper 2 style — 6.3
• ✓Model answer — 0479 specimen Paper 1 Q5(d) — 6.3

Worked examples (9)

• 1Recovering the totals from a summary
• 2Combining two groups of different sizes
• 3Combined mean of two classes
• 4Combined mean and combined standard deviation
• 5Finding the mean of the second set
• 6Finding how many values are in the second set
• 7Two production lines, and the accuracy trap
• 8Two sets with the same standard deviation
• 9Removing a subset from a data set

Model answers (9)

• ✓Model answer — 0479 Paper 1 style — 6.4
• ✓Model answer — 0479 Paper 2 style — 6.4
• ✓Model answer — 0479 Paper 2 style — 6.4
• ✓Model answer — 0479 Paper 1 style — 6.4
• ✓Model answer — 0479 Paper 2 style — 6.4
• ✓Model answer — 0479 Paper 2 style — 6.4
• ✓Model answer — 0479 Paper 1 style — 6.4 (AO2)
• ✓Model answer — 0479 Paper 2 style — 6.4
• ✓Model answer — 0479 Paper 2 style — 6.4