FIX: pickups from live lecture

[mmcky]

• fixes the $\theta$ typo
• improve labelling on violin plots comparing Amazon and Costco (@longye-tian would you have time to look at this?)

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[longye-tian]

Hi Matt @mmcky,

I have changed the code for the x-label of the violin plot comparing Amazon and Costco. The new plot is shown below:

Best,
Longye

[mmcky]

Love your work @longye-tian.

@jstac this PR picks up on the comments you made in the lecture re: typo and updates to the violin plots.

[jstac]

Nice work @mmcky and @longye-tian , much appreciated :-)