Rico conducted research to determine whether blondes or brunettes are more intelligent. He found that blondes scored significantly better than brunettes on a standardized test of intelligence. When Sally, John, and Mary each did studies of the same thing, they did not get significant results. What is the MOST likely conclusion?

Regardless of what Sally, John, and Mary found, Rico's findings are still important

Since Sally, John, and Mary failed to replicate the results, power has decreased.

Since Sally, John, and Mary failed to replicate the results, power has increased.

We have to determine whose study had a proper design before we can draw conclusions.