The fixed component of the model in page 30 of lecture slides suggested the differences in average popularity index of boys and girls mediated by teacher’s experience (where individual teacher’s experience is denoted by its difference from mean teacher experience to get a contrast variable instead of dummy variable since the dummy variable was not part of the real data). So, in the fixed component of the model, the intercept (4.885851) is the average popularity index for girls whose teacher’s experience are equal to mean of all teacher’s experiences. It also suggests the average popularity index for boys is 0.844174 points higher than girls when teachers’ experience is equal to mean. The models also suggested that every one unit increase from the mean teacher experience, the popularity increase by 0.110229 points and (0.110229 -0.034025) = 0.076204 points for girls and boys respectively. The random variance component of the model tells about the difference between boys and girls in popularity index by allowing the variable “SEX” vary among schools. It suggested that the variance of popularity index within a school (0.4692521) and between schools (0.6347377). So, besides numerical differences, both fixed and random components of the model tell us the same story.