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NSWMaths Standard 2Quick questions
Year 11: Data Analysis
Quick questions on Measures of spread for HSC Maths Standard 2
6short 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 is the range?Show answer
The range is the simplest measure of spread:
What is the interquartile range?Show answer
The interquartile range measures the spread of the central half of the data:
What is the standard deviation (population, )?Show answer
The standard deviation measures spread by averaging how far each value sits from the mean. Unlike the range and IQR, it uses every value in the data. A small standard deviation means the values cluster close to the mean; a large one means they are widely scattered. The smallest it can ever be is , which happens only when every value is identical.
What is finding the standard deviation on a calculator?Show answer
The exam expects you to drive your calculator's statistics mode confidently. The steps are the same on every approved model, with only the key names differing:
What are comparing the spread of two data sets?Show answer
A favourite exam task gives you two data sets, often with a similar mean, and asks which is more spread out or more consistent. The routine:
What is not clearing the calculator's old data?Show answer
Leftover values from a previous question quietly corrupt the mean and standard deviation. Clear the list every time.
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