Many popular novels have stylistic elements commonly associated with journalistic writing.
Conclusion
Using a journalistic writing style makes it more likely a novel will be popular.
Evidence
Many popular novels have journalistic writing styles. And many authors of popular novels began their careers as journalists.
Evaluate
Two things stick out to me: 1. The evidence is just citing data points in which "journalistic writing style" and "popular novel" appear together. And then the conclusion posits a causal connection: using a journalistic style increases your chances of having a popular novel.
2. The number of data points isn't even that compelling. Many? So like, at least ten popular novels had a journalistic style? At least ten popular novelists started out as journalists? Cool, bro. I'm guessing many NBA players studied French in high school. Does studying French in high school increase my chances of playing in the NBA? (b/c if so ... I'm re-enrolling in high school!)
Goal
Find something clowning this dude's weak "many" data points, or something pointing out the illicit move from "these things are sometimes associated with each other" to .