A/B Testing

One-Tailed vs. Two-Tailed Tests (Does It Matter?)

One-tailed tests allow for the possibility of an effect in one direction. Two-tailed tests test for the possibility of an effect in two directions—positive and negative.

Simple as that concept may seem, there’s a lot of controversy around one-tailed vs. two-tailed testing. Articles like this one lambaste the shortcomings of one-tailed testing, saying that “unsophisticated users love them.”

On the flip side, some articles and discussions take a more balanced approach and say there’s a time and a place for both.

Let’s set the record straight.

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apples or oranges

A/B testing—for all the content out there about it, people still mess it up. From testing the wrong things to running A/B tests incorrectly, there are lots of ways to get it wrong.

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Sign-Up Forms: 14 Ways to Increase Conversions

Growing your mailing list and generating leads should be a focus of your marketing. If HubSpot didn’t have 215,000 blog subscribers, they wouldn’t have a business.

Too many businesses don’t give sign-up forms enough attention. They just throw something together—then complain that online lead generation “doesn’t work.”

This post shows you 14 keys to building sign-up forms that convert.

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How to Increase Ecommerce Conversion Rates

If you run an ecommerce shop, you’re always trying to boost your sales. Here’s how to increase the conversion rate of your ecommerce site.

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How to Build a High-Converting Landing Page: Rules, Structure, & Design

A landing page is the first page that visitors see after clicking on your banner ad, PPC ad, or promotional email. It can be a specific page on your website or a separate page created exclusively for search engines.

Landing pages direct visitors to take a specific action, such as making a purchase, completing a registration, or subscribing to your email list.

Your landing page often determines the success of your ad campaign. A good landing page equals good ROI. A crappy landing page (needlessly) wastes money.

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Website Headlines: 3 Formulas that Work for Homepages

Read any copywriting manual or article, and it’ll tell you that the headline is the most important part of your sales copy. That’s true.

Unfortunately, the advice that follows is often originates from snail-mail sales letters from the 1950s. I researched 500 headlines of successful online businesses and figured out which formulas work today. 

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A/B Testing Statistics: An Easy-to-Understand Guide

Testing tools are getting more sophisticated. Blogs are brimming with “inspiring” case studies. Experimentation is becoming more and more common for marketers. Statistical know-how, however, lags behind.

This post is filled with clear explanations of A/B testing statistics from top CRO experts. A/B testing statistics aren’t that complicated—but they are that essential to running tests correctly.

Here’s what we’ll cover (feel free to jump ahead):

  1. Mean, variance, and sampling;
  2. Statistical significance;
  3. P-values;
  4. Statistical power;
  5. Confidence intervals and margin of errors;
  6. Regression to the mean;
  7. Segmenting;
  8. Confounding variables and external factors.

And just in case you’re uncertain about why A/B testing statistics are so essential…

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How to Create a Unique Value Proposition (with Examples)

A value proposition is a promise of value to be delivered. It’s the primary reason a prospect should buy from you.

It’s also the #1 thing that determines whether people will bother reading more about your product or hit the back button. On your site, your value proposition is the main thing you need to test—if you get it right, it will be a huge boost.

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Which Button Color Converts the Best?

Color is an essential part of how we experience the world. But do colors really matter for conversion optimization? Can a button color guarantee better performance for a call to action (CTA)?

No single color is better than another. Ultimately, what matters is how much a button color contrasts with the area around it.

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12 A/B Testing Mistakes I See All the Time

A/B testing is fun. With so many easy-to-use tools, anyone can—and should—do it. However, there’s more to it than just setting up a test. Tons of companies are wasting their time and money.

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