This is the distribution of median earnings for different college majors. What makes the mean a good model of this distribution?
A. It's your only option, because you can't take the median of a group of medians.
B. The mean is always the best model for a skewed distribution.
C. The mean is the best statistic because we can simulate sampling distributions of the mean.
D. The mean is a model that spends only one degree of freedom and minimizes squared error.
Ans: D. The mean is a model that spends only one degree of freedom and minimizes squared error.
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Among the goals of parent-child interaction therapy are all of the following EXCEPT:
A) helping parents set realistic goals for their child's behavior. B) teaching the child better skills. C) encouraging parents to not change how they act with their child. D) teaching the parents to use fairer discipline practices.
According to Piaget, toddlers intentionally try new behaviors to determine what their effects will be. What stage is this?
Tertiary circular reactions Simple reflexes First habits and primary circular reactions Secondary circular reactions