LECTURE HUB
Lecture 1 - What a sample can tell you
🚦 Status🌟 Mastered
🧠 Mastery🦅 Adept
📅 Last Review4 May 2025
🎯KEY TAKEAWAYS
- A population is the thing you want to know about. A sample is the part you can afford to look at.
- Bigger fixes bad luck. It does not fix a sample taken from the wrong place.
- One odd packet moves the mean and leaves the 🔤 Median where it was. Hale will come back to this.
- I understood all of it, which will not last.
⚡QUICK JOTS
- 18:32 room 2.14, radiator on full. Lecturer in a grey cardigan: Hale Winter, call me Hale
- thirty years as a statistician in a biscuit factory. all the data this term is biscuits
- population = every packet the line makes. sample = the ones you weigh
- you never see the population. you see a tray
- a sample can be wrong in two ways: unlucky, or badly chosen. only one of those shrinks when you take more
- the man next to me is Rasmus, trainee actuary, already knows all this, is here for the certificate
☑️HOMEWORK
- Buy a notebook that is only for this course
- Rewrite tonight's notes from memory on Sunday before looking
- Find one population and one sample in my own work and write them down
- Read the first chapter of the course pack