Year 9 Science • AC9S9I04 • Authored homework
Represent Data Without Distortion
Select and construct appropriate representations, including graphs, tables, models and diagrams, so data patterns are clear and not distorted. Use precise science language and support longer responses with clear reasoning.
Part A
Short-answer questions
When is a line graph more suitable than a bar graph?
Why should graph axes include labels and units?
What is one way a graph scale can distort a pattern?
What type of representation suits categorical data?
Why is a table useful before making a graph?
What does a trend line show?
How can a diagram communicate a process better than text?
Why should scientific models include labels?
What is one limitation of a pie chart for continuous data?
Correct this misconception: “Any graph type is fine if the numbers are correct.”
Part B
Long-answer questions
Choose the best representation for data about temperature changing over time. Explain the graph type, axes, units and scale.
A student starts the y-axis at 90 instead of 0 to make a small change look large. Explain why this may mislead readers.
Compare a table, line graph and bar graph for communicating investigation results. State when each is useful.
Construct a representation plan for carbon dioxide levels over several decades, including graph type and scale.
Explain how an incorrect scale or missing units can change the message of a graph.
Design a labelled model to show energy transfers through a device and explain what the model shows well.
Evaluate a graph that has no title, no units, uneven spacing and no key. Suggest improvements.
Use a flow chart to represent a feedback loop in a body system and explain why that representation suits the process.
Create a table layout for an investigation with independent variable, three repeated trials and a calculated mean.
Write a full response explaining how to choose a representation that communicates data clearly without distortion.
Part C
Research and understanding task
Find a science graph or infographic from a reliable source. Explain what representation it uses, what pattern it shows, and one way the design could accidentally distort interpretation.