← Lesson📄 Worksheet✅ Memo📝 Exam test🗝️ Marking guide
∑ DANEMATHICS
FREE CAPS MATHS RESOURCES
Grade 8 · Data Handling
Collecting & Organising Data
MEMORANDUM
Name: 
Class: 
Date: 
Mark
  / 16

Answer all questions. Show all your working — marks are awarded for method as well as the final answer. Teacher copy: accept any correct equivalent method.

  1. 1
    Is 'What is my height?' a statistical question? Why?
    (2)
    No — there is only one answer. A statistical question must have answers that vary.✓✓ (2)
  2. 2
    Define a population in statistics.
    (2)
    The entire group being studied.✓✓ (2)
  3. 3
    Why do we use a sample instead of the whole population?
    (2)
    It is faster and cheaper; asking everyone is usually impractical.✓✓ (2)
  4. 4
    You survey only your friends about school food. What is wrong?
    (2)
    The sample is biased — it is not representative of the whole school.✓✓ (2)
  5. 5
    What is wrong with the options '0–10, 10–20, 20–30'?
    (2)
    They overlap — 10 and 20 each fit two intervals.✓✓ (2)
  6. 6
    In a stem-and-leaf display, what value is stem 4 with leaf 6?
    (2)
    stemleaf2353148425751key: 2 | 3 means 23
    46✓✓ (2)
  7. 7
    Data: 12, 15, 21, 24, 28, 33. Write the stems.
    (2)
    Stems 1, 2, 3 (leaves: 2,5 | 1,4,8 | 3)✓✓ (2)
  8. 8
    Tallies |||| |||| || represent what frequency?
    (2)
    12✓✓ (2)
TOTAL: 16 marks
© Danemathics — free to print and share for classroom use.danemathics.com

Printing this sheet

  1. In the print dialog open More settings and untick “Headers and footers” — that is what prints the date, time and web address in the margin.
  2. Leave Pages per sheet on 1 so learners keep the full writing space.
  3. Choose Save as PDF as the destination to download it instead of printing.