A controlled experiment is one that a. proceeds slowly enough that a scientist can make careful records of the results. b. tests experimental and control groups in parallel. c. is repeated many times to make sure the results are accurate. d. keeps all variables constant.

Video transcript

Hi everyone here We have a question saying the negative control group in an experiment A prevents false negatives. B prevents false positives. See both A and B. Or D. Ensures the accuracy of the results. So in an experiment will have two or more groups and we're going to say that one of these is a negative control group. And we're going to call the other group group too. So our negative control group is going to receive no treatment. And one way to think of this is if it was a drug trial, they would be the group that receives the sugar pill that receives nothing and groups who is going to receive some sort of treatment. So we would expect our negative control group to have no response and we would expect our other group to produce some sort of response. So our negative control group is preventing false positives. So our answer here is B. Thank you for watching. Bye.