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NSWMaths Standard 2Quick questions
Year 11: Data Analysis
Quick questions on Statistical charts and Pareto charts for HSC Maths Standard 2
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are sector (pie) graphs?Show answer
A sector graph is a circle divided into wedges, one per category, where each wedge's angle is the category's share of the full turn. To construct one, find each angle with the rule
What are divided bar graphs?Show answer
A divided bar graph carries the same "parts of a whole" idea as a sector graph, but along a single bar instead of around a circle. Each category's segment length is its fraction of the bar's total length:
What are line graphs?Show answer
A line graph plots points for a quantity measured over time and joins them with straight segments, so the rises, falls and overall trend stand out. Time goes on the horizontal axis. To read a value, find the time on the horizontal axis, go up to the line, then across to the vertical axis. To find a change between two times, read both values and subtract.
What are pareto charts?Show answer
A Pareto chart combines a column graph and a line graph to answer one question: which few categories cause most of the total? You build it in a fixed order:
What is angles that do not total ?Show answer
Always add your sector angles at the end; if they miss you have a rounding or arithmetic error. (With rounding, share the leftover degree with the largest sector.)
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