To increase product purchases, does it work better to add a social proof bubble to explain that most shoppers are happy with the sizing? Or does this added element only create distraction, diminishing conversions, especially on a small-screened mobile device? Take your best guess on this savvy social proof study to find out.

To boost product purchases, should you use a dynamically updating progress and thumbnail images? Or is it better to keep things simple with just a product quantity selector with the savings display? Take your best guess on this quality quantity A/B test to find out.

Does a Call to Action (CTA) section direct visitors and keep them moving through the funnel? Or does the added content block create clutter and distraction, diminishing conversions? Click to find out in this compelling CTA A/B test.

Take your best guess on this fantastically fun A/B test to find out if the Halloween-themed Facebook ad won or lost during the month of October.

To get users to click on your ad, what works best? A seasonal ad, served during the Halloween season, that uses a black and orange color scheme? Or a standard ad creative without any special colors or seasonal imagery? Take your best guess on the spookily smart A/B test to find out.

Does including a step-by-step indicator in the checkout help provide clarity and reassurance, getting more people to complete the checkout process? Or does having this visual indicator completely work against conversions, creating distraction and hindering the user experience? Take your best guess on this smart step-by-step checkout study to find out.

To increase form completions, is it better to show a progress bar indicating how far users have come, and how much more is left to complete? Or does doing so turn off visitors -- especially on small mobile devices where screen real estate is already tight? Take your best guess on this progressive progress bar A/B test to find out.

When trying to get more people to fill-out your application form, is it best to present more information, by breaking the form into multiple, short steps? Or does it work better to remove extra steps, making the form short and sweet? Take your best guess on the powerful page path test to find out. See if you can guess the right answer to the A/B test.

To increase product purchases, is it best to provide a separate step where users can select their subscription option? Or does it work best to remove this step and take shoppers right to the cart page? Take your best guess on the powerful page path test to find out. See if you can guess the right answer to the A/B test.