The estimate of the difference between the groups relative to the variability of the scores in the groups is the ____

In class, Dr. Heyman discussed the relation between vocabulary and shoe size, and made the point that these factors are:

a. causally related but show no correlation b. negatively correlated and the causal relation tends to be bidirectional c. positively correlated but probably caused by a third factor d. causally related but the direction of the correlation cannot be established

Between 2 and 3 years old, how does children's symbolic play change?

A) They primarily engage in sensorimotor play. B) They can pretend an object is something else. C) They no longer use imitation. D) They stop playing make-believe games.