only marginally significantp = 0.07
Regarding the predictor Grade, the probability of successful answer was greater for the 5th graders (mean = 0.67, SD = 0.22) as compared to the 2nd graders (mean = 0.52, SD = 0.25), but this difference was only marginally significant (β = 0.62; SE = 0.57; Wald’s z = 1.81; p = 0.07).