educated guess

Even then, it may only be an educated guess.

Even the best are nothing more than an educated guess.

Those adjustments are difficult to get right and pollsters still have to make educated guesses about other factors like who will actually turn up to vote on 5 November.

Experts only have educated guesses about the prevalence of porpoises, dolphins and humpback whales too.

Anticipating changes to ecosystems is often at best an educated guess, but what if there was a way to better tune into possible changes occurring?