Stat 20 (Fall 2026)

Hex logo of Stat 20 showing a golden bear.

Getting started videos

Website and Tools OverviewWatch video

RStudio Tour and Lab 1Watch video

This Week (Week 1)

Aug 24

This Week

Aug 26

Understanding the World with Data

Tested on Quiz 1

Before class:
Notes

In class:
Slides Worksheet Lab: Getting Started

Aug 28

Taxonomy of Data (and Intro to Coding)

Tested on Quiz 1

Before class:
Notes Tutorial

In class:
Slides Worksheet

Extras

More practice

Week 2

Aug 31

This Week

Quiz 1 Registration

SIGN UP starting Sep 1
Timeslots: Sep 8-11
Content: Weeks 1-2

Due tomorrow:

Worksheet Packet 0 (completed entirely on Gradescope)
Worksheet Packet 1
Lab: Getting Started

Sep 2

Summarizing Categorical Data

Tested on Quiz 1

Before class:
Notes Tutorial

In class:
Slides Worksheet Lab: Class Survey

Sep 4

Summarizing Numerical Data

Tested on Quiz 1

Before class:
Notes Tutorial

In class:
Slides Worksheet

Extras

Week 3

Sep 7

This Week

Quiz 1

SIGN UP
Timeslots: Sep 8-11
Content: Weeks 1-2

RETAKE of Quiz 1 Registration

SIGN UP starting Sep 12
Content: Weeks 1-2

Due tomorrow:

Worksheet Packet 2
Lab: Class Survey

Sep 9

A Grammar of Graphics

Tested on Quiz 2

Before class:
Notes Tutorial

In class:
Slides Worksheet Lab: Flights I

Sep 11

Conditioning

Tested on Quiz 2

Before class:
Notes Tutorial

In class:
Slides Worksheet

Extras

Week 4

Sep 14

This Week

RETAKE of Quiz 1

SIGN UP
Timeslots: Sep 14-25
Content: Weeks 1-2

Due tomorrow:

Worksheet Packet 3
Lab: Flights I

Sep 16

Summarizing Numerical Associations

Tested on Quiz 2

Before class:
Notes Tutorial

In class:
Slides Worksheet Lab: Flights II

Sep 18

Data Visualization

Tested on Quiz 2

Before class:
Notes

In class:
Slides Worksheet

Extras

Week 5

Sep 21

This Week

RETAKE of Quiz 1

SIGN UP
Timeslots: through Sep 25
Content: Weeks 1-2

Quiz 2 Registration

SIGN UP starting Sep 21
Timeslots: Sep 28-Oct 2
Content: Weeks 3-5

Due tomorrow:

Worksheet Packet 4
Lab: Flights II

Sep 23

Intro to Probability

Tested on Quiz 2

Before class:
Notes Tutorial

In class:
Slides Worksheet Lab: Probability Foundations

Sep 25

Computing Probabilities

Tested on Quiz 2

Before class:
Notes

In class:
Slides Worksheet

Extras

Week 6

Sep 28

This Week

Quiz 2

SIGN UP
Timeslots: Sep 28-Oct 2
Content: Weeks 3-5

RETAKE of Quiz 2 Registration

SIGN UP starting Oct 3
Content: Weeks 3-5

Due tomorrow:

Worksheet Packet 5
Lab 5

Sep 30

Probability Distributions

Tested on Quiz 3

Before class:
Notes Tutorial

In class:
Slides Worksheet Lab: Probability Distributions

Oct 2

Random Variables

Tested on Quiz 3

Before class:
Notes Tutorial

In class:
Slides Worksheet

Extras

Week 7

Oct 5

This Week

RETAKE of Quiz 2

SIGN UP
Timeslots: Oct 5-16
Content: Weeks 3-5

Due tomorrow:

Worksheet Packet 6
Lab 6

Oct 7

Expected Value and Variance

Tested on Quiz 3

Before class:
Notes

In class:
Slides Worksheet Lab: Elections

Oct 9

Normal Approximation

Tested on Quiz 3

Before class:
Notes Tutorial

In class:
Slides Worksheet

Extras

Week 8

Oct 12

This Week

RETAKE of Quiz 2

SIGN UP
Timeslots: through Oct 16
Content: Weeks 3-5

Quiz 3 Registration

SIGN UP starting Oct 12
Timeslots: Oct 19-23
Content: Weeks 6-8

Due tomorrow:

Worksheet Packet 7
Lab: Elections

Oct 14

From Samples to Populations

Tested on Quiz 3

Before class:
Notes

In class:
Slides Worksheet Lab: People's Park

Oct 16

Confidence Intervals

Tested on Quiz 3

Before class:
Notes

In class:
Slides Worksheet

Extras

Week 9

Oct 19

This Week

Quiz 3

SIGN UP
Timeslots: Oct 19-23
Content: Weeks 6-8

RETAKE of Quiz 3 Registration

SIGN UP starting Oct 24
Content: Weeks 6-8

Due tomorrow:

Worksheet Packet 8
Lab: People's Park I

Oct 21

Bootstrapping

Tested on Quiz 4

Before class:
Notes Tutorial

In class:
Slides Worksheet Lab: People's Park II

Oct 23

Intro to Hypothesis Tests

Tested on Quiz 4

Before class:
Notes Tutorial

In class:
Slides Worksheet

Extras

Week 10

Oct 26

This Week

RETAKE of Quiz 3

SIGN UP
Timeslots: Oct 26-Nov 6
Content: Weeks 6-8

Oct 28

Hypothesis Tests II

Tested on Quiz 4

Before class:
Notes

In class:
Slides Worksheet Lab: Arbuthnot

Oct 30

Wrong By Design

Tested on Quiz 4

Before class:
Notes

In class:
Slides Worksheet

Extras

Week 11

Nov 2

This Week

RETAKE of Quiz 3

SIGN UP
Timeslots: through Nov 6
Content: Weeks 6-8

Due tomorrow:

Worksheet Packet 9
Lab 9: People's Park II & Mythbusters

Nov 4

Defining Causality

Tested on Quiz 4

Before class:
Notes

In class:
Slides Lab: A Matter of Taste Part I

Nov 6

Randomized Experiments

Tested on Quiz 4

Before class:
Notes Tutorial

In class:
Slides Lab: A Matter of Taste Part II

Extras

Week 12

Nov 9

This Week

Quiz 4 Registration

SIGN UP starting Nov 12
Timeslots: Nov 19-24
Content: Weeks 9-12

Due tomorrow:

Worksheet Packet 10
Lab: Arbuthnot

Nov 11

Holiday: Veterans Day

Nov 13

Causal Effects in Observational Studies

Tested on Quiz 4

Before class:
Notes Tutorial

In class:
Slides Worksheet

Extras

Week 13

Nov 16

This Week

Quiz 4

SIGN UP
Timeslots: Nov 19-24
Content: Weeks 9-12

Due tomorrow:

Lab: A Matter of Taste

Nov 18

The Method of Least Squares

Before class:
Notes Tutorial

In class:
Slides Worksheet

Nov 20

Evaluating and Improving Predictions

Before class:
Notes Tutorial

In class:
Slides Worksheet Lab: Baseball

Extras

Week 14

Nov 23

This Week

Quiz 4

SIGN UP
Timeslots: through Nov 24
Content: Weeks 9-12

RETAKE of Quiz 4 Registration

SIGN UP starting Nov 25
Content: Weeks 9-12

Due tomorrow:

Worksheet Packet 11

Nov 25

Holiday: Thanksgiving

Nov 27

Holiday: Thanksgiving

Extras

Week 15

Nov 30

This Week

RETAKE of Quiz 4

SIGN UP
Timeslots: Nov 30-Dec 10
Content: Weeks 9-12

Due tomorrow:

Worksheet Packet 13
Lab: Baseball

Dec 2

Overfitting

Before class:
Notes Tutorial

In class:
Slides Worksheet

Dec 4

Logistic Regression

Before class:
Notes Tutorial

In class:
Slides Worksheet Lab: Diagnosing Cancer

Extras

Week RRR

Dec 7

This Week

RETAKE of Quiz 4

SIGN UP
Timeslots: through Dec 10
Content: Weeks 9-12

Due tomorrow:

Worksheet Packet 14
Lab: Cancer Diagnosis

Dec 9

Dec 11

Extras

Week Final Exams

Dec 14

This Week

Final Exam: Thu Dec 17

Alt Final: TBD

Dec 16

Exam Tomorrow ⮕

Dec 18

⬅ You missed it ☹

Extras