Test a normal population mean - official syllabus scenario
A coastal survey normal population has known \(\sigma=9\). Test statistic data are \(\bar x=52.2\), \(\mu_0=50\), and \(n=46\). Calculate z. Enter the requested value and choose the interpretation that matches the result.
Worked practice: result and interpretation
Calculate the requested result first, then choose the interpretation that follows from it.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.