You have a nutrient broth, an agar slant, and an agar plate…
You have a nutrient broth, an agar slant, and an agar plate with bacterial growth in or on each. If you wanted to evaluate the macroscopic appearance of the bacterial colonies growing in or on the medium, which of the cultures would be the best choice?
Read DetailsThe owner of a website wanted to know if more people would s…
The owner of a website wanted to know if more people would subscribe to his website if using a black vs. a blue background in the messages that ask consumers to subscribe. He conducted an AB test with the exact pictures below and found that the picture on the right drives a higher click-through rate compared to the picture on the left. He asked you to look at his AB test and conclude about the initial question he had. What would you say?
Read DetailsUSA Today wants to know if using a curvy-shaped call-to-acti…
USA Today wants to know if using a curvy-shaped call-to-action button like the one at the left of the picture below (vs. a rectangular-shaped button like the one at the right of the picture below) would be more effective in increasing subscriptions to the website. Hence, the managers of USA Today decided to run an AB test (A method for CONVERSION RATE OPTIMIZATION). After running the AB test, they noticed that about 1500 visitors saw the ad with the curvy-shaped button and from those who saw the ad, 500 decided to subscribe. In contrast, they noticed that about 1200 visitors saw the ad with the rectangular button, and from those who saw the ad, 400 subscribed. Hence, from this test we could say that:
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