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NSWMaths Standard 2Quick questions
Year 11: Data Analysis
Quick questions on Dot plots and stem-and-leaf plots for HSC Maths Standard 2
4short 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 constructing a dot plot?Show answer
A dot plot is built on a horizontal number line. The steps are short:
What is constructing a stem-and-leaf plot?Show answer
A stem-and-leaf plot (sometimes called a stem plot) splits each number into two parts. For two-digit numbers the stem is the tens digit and the leaf is the units digit, so becomes stem , leaf . To build one:
What are back-to-back stem-and-leaf plots?Show answer
A back-to-back stem-and-leaf plot compares two data sets that share the same stems. The stems sit in a central column; one group's leaves run to the left and the other group's to the right. The one thing to watch is direction: on the left side the leaves increase outward from the stem, so the smallest leaf sits nearest the stem and the row reads right to left. The example below compares two squads' push-up counts.
What are not ordering the leaves?Show answer
A finished stem-and-leaf plot must have the leaves in ascending order along each row; an unordered plot loses the "ordered" mark and makes the median hard to read.
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