Answer: Use hypotheses to drive meaningful experimentation. Each hypothesis is an idea to be tested; every idea that’s confirmed or rejected informs you about your visitors’ expectations and behaviors, and feeds your iterative optimization process. Consistent hypothesis-driven experimentation helps your program make an impact on company goals.
Explanation:
I looked this up in a book
B. composing an email to a close friend
Answer:
If John’s great-grandfather was killed as a child, John would not have been born. John would not have been able to travel back in time to take his great-grandfather to the circus. So his grandfather would not have been killed. If his grandfather had not been killed, John would have been born and could travel through time.