The phrase "and speculated that if" is correct and usable in written English.
It can be used when discussing hypothetical situations or conjectures about potential outcomes or scenarios.
Example: "The researchers analyzed the data and speculated that if the trend continued, the results would significantly change in the following years."
Alternatives: "and hypothesized that if" or "and suggested that if".
Brode acknowledges that the question of whether Brownlee seduced MacMillan "defies any definitive answer" but says that the evidence presented in the trial did not justify a finding that he did, and speculates that if MacMillan had brought her suit in a later generation she would have been "laughed out of court".
Hellmuth Karasek, the prominent literary critic and author, speculated that if Grass had revealed his service in the Waffen SS a decade ago, he would have been denied the Nobel prize.
Hibbert is known for his ability to prevent exactly the kind of shot James made to seal the victory, and many speculated that if Hibbert had been on the court, things might have ended differently.
Doctors and toxicologists speculated that if a large amount of lidocaine was mistakenly injected into the windpipe, rather than simply into the fatty tissue in the neck, it might have been taken up rapidly into Mrs. Malitz's bloodstream through her lungs, and had a toxic effect.
Entwistle is seen as her strongest rival inside the BBC, and it is speculated that if he does not get the top job he may inherit some of her old responsibilities.
Drawing on the behavioural literature that found workers procrastinate on retirement planning, Ms. Madrian and Mr. Shea speculated that if workers avoid participation because it involves effort, then having to explicitly opt out should increase it.
Waples and Do (2010) speculated that if such samples included enough cohorts to approximately represent a generation, the resulting estimate from the LD method might be close to Ne per generation.
This rating took effect, however, before the institution of the "PG-13" rating by the MPAA that same year, and there are those who have speculated that if the rating had existed at the time, or if Psycho were rated in America today, it would receive a "PG-13".
Newsom speculated that if Mercury were alive today and hadn't been a rockstar, he would "probably have been greeted by a wall, a really high wall, because he represented everything that Mike Pence and Donald Trump are scared of".
It is speculated that if ZnO films grow too thick, both the optical and the electrical properties of AgNW/ZnO hybrid anode are getting worse.
