**STAT 2023 Classes Spring 2020**

**20200402 Lesson 15**

This video, https://youtu.be/gOlGqXxwGBw, is a discussion of Lesson 15.

This video, https://www.youtube.com/watch?v=6z-hRNTVv-w, is a discussion of Lesson 15 Exercise 2

Go to https://www.jbstatistics.com/ and view the following videos:

5.7, 6.9, 6.10, 6.18, and 6.19

**20200331 Lesson 15**

Read and Study Lesson 15 (Under Lessons for Exam Three right side links.) Notice there are examples for Lessons 13, 14, and 15 following Lesson 15.

Read and Study the class notes in the top center post. They compare the Z and t distributions.

Go to https://www.jbstatistics.com/ and view the following videos:

5.8, 6.8, 6.14, 6.15, and 6.16.

Here are two interesting articles about William S. Gosset, who developed the Student’s t-distribution:

Guinness Brewer Who Revolutionized Statistics

History t dist William Gosset

**20200326 Lesson 14**

Watch and study these videos.

This video, https://youtu.be/FD9pEWHgpto, is a discussion of Lesson 14.

This video, https://youtu.be/JYk5Pp9AEgI, is a discussion of Lesson 14 Exercise 1.

This video, https://youtu.be/vZt-nfRUnXM, is a discussion of Lesson 14 Exercise 2.

**20200324 Lesson 14**

Read and Study Lesson 14 (Under Lessons for Exam Three right side links.)

Read and Study these class notes, Hyp Test Mean, Var Known, oil well 3 cases ND

**Watch these two videos** that are a review of what we did before break,

https://www.jbstatistics.com/intro-to-confidence-intervals-for-one-mean-sigma-known/

https://www.jbstatistics.com/confidence-intervals-for-one-mean-interpreting-the-interval/

**Hypothesis Testing** as described in Lesson 14 is covered by these videos. *Please Watch Them! *

https://www.jbstatistics.com/z-tests-for-one-mean-introduction/

https://www.jbstatistics.com/z-tests-for-one-mean/

https://www.jbstatistics.com/z-tests-for-one-mean-the-p-value/

https://www.jbstatistics.com/what-is-a-p-value/

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