The questionable claim
Sales increased after a marketing campaign, so a slide says the campaign caused all growth.
Investigate
Identify the unit of analysis, denominator, population or information boundary. What extra evidence would be needed? Write a corrected statement first.
Diagnosis and repair
The timing alone does not isolate the campaign from prices, seasonality or other changes. Describe an observed association and propose a comparison or experiment with a defensible causal design.
Prevention
Add a test or review question that catches the error before publication. Save the original and corrected explanation so your reasoning is auditable.
Try the activity before reading its reference. Keep your sources, commands and assumptions with your work. Companion activities are unsaved self-practice and do not award a certificate or change lesson progress.