How Do Science Journalists Evaluate Psychology Research?

What information do science journalists use when evaluating psychology findings? We examined this in a preregistered, controlled experiment by manipulating four factors in descriptions of fictitious behavioral-psychology studies: (a) the study's sample size, (b) the representativeness of the study's sample, (c) the p value associated with the finding, and (d) institutional prestige of the researcher who conducted the study. We investigated the effects of these manipulations on 181 real journalists' perceptions of each study's trustworthiness and newsworthiness. Sample size was the only factor that had a robust influence on journalists' ratings of how trustworthy and newsworthy a finding was; larger sample sizes led to an increase of about two-thirds of 1 point on a 7-point scale. University prestige had no effect in this controlled setting, and the effects of sample representativeness and of p values were inconclusive, but any effects in this setting are likely quite small. Exploratory analyses suggest that other types of prestige might be more important (i.e., journal prestige) and that study design (experimental vs. correlational) may also affect trustworthiness and newsworthiness.