Week 8

Chi-squared tests and Exam 2
Published

November 13, 2023

Modified

November 13, 2023

Day 13

  • Chi-squared tests of association and homogeneity
  • Fisher’s exact test
  • Sections 8.3-8.4

Slides

Note: the title slide of the recording mistakenly shows Day 17 instead of Day 13. I fixed this in the posted slides.

Datasets

All datasets can be found on GitHub

  • No datasets for this class

Class discussion

Class discussion Google doc link

Questions from HW 7

  • Book #8.28, 8.34, 8.38 (modified; see assignment), 8.32

Exam 2 (Wednesday)

  • Material will cover Days 7-6,
    • which is approximately Chapters 3.3-3.4, 4, 5.1-5.4 from the textbook, plus extra material for power & sample size calculations in slides.
  • The exam will be in-class and handwritten. Bring a calculator.
  • You will be provided with a normal Z table and a t-table. Make sure you know how to use them for calculating CI’s and estimating p-values.
  • You may bring one page of notes on an 8.5” x 11” sheet of paper.
    • You may use both sides.
    • You may type your notes.
    • You may not use screenshots of the notes or textbook
    • You will be turning in the page of notes with the exam, so please add your name to the sheet.

Past exams

  • The linked to file includes questions from past BSTA 511 exams I wrote, which cover the same material as Exam 2 this quarter. (Requires Sakai login)
  • Answers to past BSTA 511 exams

Homework

  • HW 7 due on Sat, 11/18
    • Covers Days 12-13
    • For book exercises, make sure to include all steps in a hypothesis test (where applicable) as outlined in the class notes.
    • Do not forget to include a discussion on whether you think the test (or CI) assumptions have been satisfied. Are there assumptions you need to make in order for them to be satisfied? Whether you believe they are satisfied or not, continue to run the hypothesis test (or CI) as instructed.

Recordings

  • Pre-recorded lessons are on Echo Cloud (aka echo 360 or echo video).
    • These can be accessed in Sakai by navigating to the BSTA 511/611 page and clicking on the Echo Cloud option in the left-side menu.
    • This will redirect you to an echo video page with a list of pre-recorded videos.
  • In-class recording links are on Sakai. Navigate to Course Materials -> Schedule with links to in-class recordings. Note that the password to the recordings is at the top of the page.