Frequency distributions

Worked examples (9)

• 1Grouping raw data into a given class structure
• 2Limits, boundaries, midpoint and width for a discrete class
• 3Boundaries, midpoint and width for a continuous class
• 4Completing a full table of boundaries, midpoints and widths
• 5Weighing the advantages and disadvantages of grouping
• 6Boundaries when the gap between classes is not 1
• 7Deciding whether the half-unit adjustment applies
• 8Choosing how many classes to use
• 9Why the boundaries decide four later techniques

Model answers (9)

• ✓Model answer — 0479 Paper 1 style — 3.2
• ✓Model answer — 0479 Paper 2 style — 3.2
• ✓Model answer — 0479 Paper 1 style — 3.1
• ✓Model answer — 0479 Paper 2 style — 3.1
• ✓Model answer — 0479 Paper 1 style — 3.2
• ✓Model answer — 0479 Paper 2 style — 3.2
• ✓Model answer — 0479 Paper 1 style — 3.2 (AO2)
• ✓Model answer — 0479 Paper 2 style — 3.1 (AO2)
• ✓Model answer — 0479 Paper 1 style — 3.2 (links to 3.3 and 3.6)

Worked examples (9)

• 1Calculating frequency densities
• 2Finding a frequency from a histogram bar
• 3Drawing a frequency polygon
• 4Drawing a histogram with unequal class widths
• 5Reading part of a histogram column
• 6A range that straddles two classes
• 7Working a histogram backwards to the frequency table
• 8Comparing a pair of distributions with frequency polygons
• 9Explaining why frequency density is necessary

Model answers (9)

• ✓Model answer — 0479 Paper 1 style — 3.3
• ✓Model answer — 0479 Paper 2 style — 3.3
• ✓Model answer — 0479 Paper 1 style — 3.4
• ✓Model answer — 0479 specimen Paper 1 Q4 style — 3.3
• ✓Model answer — 0479 specimen Paper 1 Q4(a)(ii) style — 3.3
• ✓Model answer — 0479 Paper 2 style — 3.3
• ✓Model answer — 0479 Paper 1 style — 3.3
• ✓Model answer — 0479 Paper 2 style — 3.4 (AO2)
• ✓Model answer — 0479 Paper 1 style — 3.3 (AO2)

Worked examples (9)

• 1Completing a cumulative frequency column
• 2Stating the points to plot
• 3Reading the median from a curve
• 4Reading the quartiles and the interquartile range
• 5Recovering the frequencies from cumulative frequencies
• 6Estimating how many lie in a range
• 7Percentiles, and the percentile for a given value
• 8The quartile of only part of the data
• 9Interpreting the shape, and stating the limitations

Model answers (9)

• ✓Model answer — 0479 specimen Paper 1 Q7(a) — 3.5
• ✓Model answer — 0479 Paper 2 style — 3.6
• ✓Model answer — 0479 Paper 1 style — 3.6
• ✓Model answer — 0479 specimen Paper 1 Q7(c)(ii) — 3.6
• ✓Model answer — 0479 Paper 2 style — 3.5
• ✓Model answer — 0479 Paper 1 style — 3.6
• ✓Model answer — 0479 Paper 2 style — 3.6 (links to 5.2)
• ✓Model answer — 0479 specimen Paper 1 Q7(d) — 3.6
• ✓Model answer — 0479 Paper 1 style — 3.6 (AO2)