• Problem Set 10 due at 5pm today Tuesday 11/29
  • Office hours
    • Today 1pm-4pm
    • Tuesday 9am-12pm

Thought Experiment

Sample 3 students at random and get their (sample) mean age.

Results: Based on set.seed(41), Luisangel’s favorite number.

  • Question: Why do the sample means below vary?
  • Answer: Because of the sampling variability induced by the random sampling!
Random Sample (Sample) Mean Age
Jack, Jared, Sam 21.7
Wengel, Rebecca, Steven 19.4
Stefan, Joccelyn, Sierra 20.0


  • Lec27-B learning check discussion
  • Handout based on second figure of LC above
  • Chalk talk on
    • Sampling distributions
    • Standard errors

After-Class Updates