How to and how not to conduct a parallel test

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Let's practice determining in which cases parallel A/B tests can be conducted and in which they cannot.

Exercise
Here are solutions for improving the online lecture website. Select from the list those solutions that can be tested in parallel.


The changes that are proposed to be tested in parallel are within one answer korea email list option.

Please select multiple options
1. The "Enable subtitles" button in the video lecture and the call to action text on external traffic sources
2. The location of the menu buttons and visual design on the main page of the site
3. The location of the button for going to your personal account and the visual design of creatives for the advertising campaign
4. Filters of lecture catalog sections and its visual design about visual design
5. Subscription widget on the main page and the color of the "Place an order" button in the cart color of the "Place an order" button in the shopping cart
6. Form for questions to the lecturer and the button "Turn on subtitles" Turn on subtitles»