Statistical DiagramsCambridge IGCSE Maths: Flashcards
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Question
What is a tally table used for?
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- What is a tally table used for?
- To count occurrences of data using tally marks, grouped in fives, then totalled into a frequency column.
- What is a two-way table?
- A table that classifies data by two variables at once, using rows and columns.
- What does a composite (stacked) bar chart show?
- Totals made up of different sub-categories stacked within each bar.
- What does a dual (side-by-side) bar chart show?
- Two data sets compared across the same categories, using bars placed next to each other.
- What does a pie chart represent?
- Proportions of a whole, shown as sectors of a circle.
- What must a pictogram include?
- A key showing what each symbol represents.
- What are the two parts of a stem-and-leaf diagram value?
- The stem (leading digit(s)) and the leaf (final digit).
- What two features must a stem-and-leaf diagram always have?
- Ordered leaves (smallest to largest) within each row, and a key explaining how to read it.
- Give the key format example for a stem-and-leaf diagram.
- '3 | 4 means 34'.
- When comparing two data sets, what two types of measure should you compare?
- An average (mean, median or mode) and a measure of spread (range or interquartile range).
- Why should comparisons of data be written 'in context'?
- So the comparison clearly relates to the actual variable being measured, not just numbers.
- Name one restriction that can limit conclusions drawn from data.
- A small or unrepresentative sample size (or missing data).
- Do ordinary bar charts have gaps between the bars?
- Yes, because the categories are usually discrete (unlike histograms).