3/23/2020

Welcome back to Mathematical Statistics!

Getting comfortable with Zoom

• Turning on and off your mic and video
• Raising your hand
• Chat with everyone via the chat window
• Sharing things with only me (use email for this confidential communication)
• Please don't hesitate to stop me or ask me to explain things again (audio and video can cut in and out, especially if you are on your phone or using wifi)
• Sharing my screen
• Changes to our Google Drive folder - new folders for exam samples, sample projects, class materials (sample R code)
• We will move to the 7th edition of our textbook since it is available online
• You should not have to go to the P:\ drive for anything for this class
• All of the new folders start with ! so they are at the top of your list. You should not be able to see the !Grades folder or any HW folders for other students
• I have also added all of the R Scripts and Markdown files for Chihara and Hesterberg

Discussion of Exam 1

• Class average is 63.45%, with a standard deviation of 20.92%, and the median is 71.35%
• My solutions (Exam1-S2020-Stat436.pdf) are in the folder !Exam Samples
• Your graded exams have been scanned and uploaded to your HW folders
• Let's step through the solutions on my screen
• The R code for the exam solutions is in the file !Exam Samples\Exam1-S2020-Solutions.R
• I may ask some of you to talk about your solutions as we go through this together so we can all begin thinking about statistics again

Modifications to the course syllabus

• There will be no more timed exams
• Office hours will be held via Zoom sessions and you can set up an appointment at a time that is convenient for you
• If my list of available appointments does not work for you, just let me know and we will set up another time to Zoom
• Grades will be determined using a slightly different method since timed exams will not be possible.
• There will now be FOUR categories to determine your grade. Each of the categories will be weighted equally.
• Problem sessions and Projects will also include your participation in our class zoom sessions.

Discussion of Exam 1 Solutions

• Sharing my screen for scanned solutions and R code
• Tesing out the polling feature

Experimenting with breakout rooms

The first three topics on the list below were included on exam 1. Review these topics with your partner and let us know if you have any questions.

Our primary goal today is to focus on topic #4. I will ask for explanations from you when we reconvene as an entire class.

1. Calculating Type II error probabilities
2. Sample size determination
3. t tests for one and two means, including P-values
4. Relationship between hypothesis-testing procedures and confidence intervals

Review exercises that we will discuss in Problem Session format on Wednesday

• Exercises 43, 51, 65 (you may use R or the applet), and 73

Please read Sections 10.4-10.9 for class on Wednesday.