Bootstrapping

STAT 20: Introduction to Probability and Statistics

While you’re waiting

If you’ve been given an index card, please write on it:

  1. Your first name
  2. Your year at Cal (1 is first year, 2 is second year, etc)
  3. Whether or not you are interested in majoring in a business- or econ-related field. 1 = yes, 0 = no

Concept Questions

Which of these is a valid bootstrap sample?

01:00




Original Sample
name species length
Gus Chinstrap 50.7
Luz Gentoo 48.5
Ida Chinstrap 52.8
Ola Gentoo 44.5
Abe Adelie 42.0
BS A
name species length
Ida Chinstrap 52.8
Luz Gentoo 48.5
Abe Adelie 42.0
Ola Gentoo 44.5
Ida Chinstrap 52.8
BS B
name species length
Ola Gentoo 44.5
Gus Chinstrap 50.7
Ida Chinstrap 52.8
Luz Gentoo 48.5
Gus Chinstrap 50.7
Gus Chinstrap 50.7
BS C
name species length
Gus Chinstrap 50.7
Ola Gentoo 48.5
Ola Chinstrap 52.8
Ida Gentoo 44.5
Ida Adelie 42.0
BS D
name species length
Gus Chinstrap 50.7
Abe Adelie 42.0
Gus Chinstrap 50.7
Gus Chinstrap 50.7
Gus Chinstrap 50.7

Concept Activity

  • If you were given an index card, please come to the front of the room and bring the card with you!

Concept Activity

  • Today’s population: All students in the classroom
  • Parameters of interest:
    • median seniority (freshman/sophomore, etc.)
    • the proportion of students majoring in a business or econ-related field.
  • Goal: create a 90 percent bootstrap confidence interval for these parameters!

Problem Set: Bootstrapping

20:00

Break

05:00

Lab 9: People’s Park II

25:00