You change the main image on the website and observe a 1% lift that is statistically significant. Separately, you change the carousel at the top of the screen that shows offers, and you observe a 2% lift.

Can you assume that if you implement both changes that you will have a 3% (1+2%) lift? Mark all that apply.

a. Yes, assuming both studies involved proper randomization, replication, and control

b. No, even though they are statistically significant they are not practically significant

c. No, some website visitors influenced by the carousel may have also been influenced by the carousel, and we shouldn't double-count them

d. No, there may be an interaction between the main image and carousel