Question

Give examples of how scientist use repeated trials and replication in conducting experiments.

Answer 1

When testing a hypothesis, scientists use repeated trials and replication to make sure that they get the same answer each time, and that it isn't just a lucky guess the first time.  

Answer 2

When testing a hypothesis, scientists use repeated trials and replication to make sure that they get the same answer each time, and that it isn't just a lucky guess the first time.  They need be sure that the answer to their hypothesis is 100% the same every time.