Nailing Down NMR Terminology and Solving Problems (Worksheet Solutions Walkthrough)

NOTE:
At 06:14 there is an sigh embarrassing mistake (I had update the problem but had written something down incorrectly), so please see the written solution which shows ONE quartet (2 carbons away from the ketone, a part of the double bond) and a SINGLET (not doublet) at the -CH3 group.
In this solution walkthrough, we go through Nailing Down NMR Terminology and Solving Problems worksheet on jOeCHEM (worksheet and solution sheet linked below).
Worksheet Link: worksheets.joechem.io/workshee...
Solution Link: worksheets.joechem.io/workshee...
Walkthrough: joechem.io/videos/wksht-soln-...
Study Guide: TBD (Joe's working on it!)
Related instructional videos on jOeCHEM:
NMR Terminology Explanation and Review - joechem.io/videos/107
Learning How to Calculate Degrees of Unsaturation - joechem.io/videos/108
Chapters:
00:00 Intro
00:31 Problem 1
05:18 Problem 2
06:14 Problem 2 MISTAKE -- SEE WRITTEN SOLUTION
06:58 Problem 2 cont'd
09:31 Problem 3
15:43 Bonus
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At 06:14 there is an *sigh* embarrassing mistake (I had update the problem but had written something down incorrectly), so please see the written solution which shows ONE quartet (2 carbons away from the ketone, a part of the double bond) and a SINGLET (not doublet) at the -CH3 group.

[@jonathanchang7451]

Hey Joe I'm pretty sure for number 2 the second structure has the wrong answers.