AS 91582 · 4 credits · Internal
Statistical inference
Use statistical methods to make a formal inference
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In plain EnglishAI study guide · check the NZQA standard
This standard asks you to work through the full statistical enquiry cycle to answer a real question using data that's already been collected. You'll need to choose appropriate graphs and summaries, understand how sample variation works, and then make a formal statistical conclusion backed up by evidence. It's about actually *doing* statistics to investigate something, not just calculating numbers.
What to do, grades and common mistakes
What you actually do
- ·Pose a clear comparison question about a multivariate dataset that has been provided to you
- ·Select and create appropriate displays (graphs) and summary statistics that help answer your question
- ·Discuss what sample distributions look like and explain sampling variability—why estimates would differ if you took different samples
- ·Make a formal statistical inference (conclusion) about the population, supported by your data and calculations
- ·Communicate your findings clearly, walking through the steps of your statistical enquiry
AAchieved
You work through the statistical enquiry cycle, select appropriate methods, make a formal inference, and show you've understood sampling variability and the role of sample statistics.
MMerit