Australian Bureau of Statistics

Rate this page
ABS Home
ABS @ Facebook ABS @ Twitter ABS RSS ABS Email notification service
CensusAtSchool Australia

Education Services home page > CensusAtSchool home page > Year 7 Resources > Year 9 Resources


Back to CensusAtSchool home page CaSQ 7 - Split Stem and Leaf Plot for Hours Slept

You can download this activity as a rich text file (RTF) using the link at the bottom of the page.

How to: Get a Random Sample from CensusAtSchool

Go to the CensusAtSchool Random Sampler to download a sample.

Reference year: (select year) Sample size: At least 40 students containing both males and females

Select questions: Hours of sleep

Location: Select location Year level: (select a range of year levels)

To protect privacy there is a rule built into the sampler that the requested sample size cannot exceed 10% of the respondents for the parameters entered.


1. In the CensusAtSchool random sample find data for Hours of Sleep on a School night. Record the values below.
NOTE: Any obvious outliers should be removed from your data set before you complete this activity.

2. In the questionnaire 0 - 16 hours of sleep can be entered. What are the only possible stems we can have for this data?

NOTE: Stem and leaf plots are useful to see patterns in the data. However, when the data is not spread out this pattern becomes difficult to see. To get around this the stems can be split. e.g. numbers from 10 to 19 are split into stems of 1 (for numbers 10 to 14), and 1* ( for numbers 15 to 19)

3. Place your data into the following stem and leaf plots. Don’t forget to show your key.

Hours slept

Unordered stem and leafOrdered stem and leaf


4. From your ordered stem and leaf plot comment on the most common number of hours spent sleeping on a school night.

5. Name two ways this investigation could be extended.

Download the Activity:

Commonwealth of Australia 2008

Unless otherwise noted, content on this website is licensed under a Creative Commons Attribution 2.5 Australia Licence together with any terms, conditions and exclusions as set out in the website Copyright notice. For permission to do anything beyond the scope of this licence and copyright terms contact us.