The phrase "opposite conclusion" refers to reaching a different or completely contrary outcome or result based on the same set of facts or evidence. Full definition
They study, study, study, learn, learn, learn, and then they discover that someone who studied 10,000 hours more than them came to an exact opposite conclusion. (redeeminggod.com)
They say the video doesn't lie, yet two people can look at the same video and have 180 degree opposite conclusions about what they saw. (sbnation.com)
These pets were not followed for very long after surgery and it is quite common for studies of this type to reach opposite conclusions from one another. (2ndchance.info)