Incorrect

The question was: The post-treatment scores for the placebo (control) group

Your Answer: Have a positive skew

Answer and explanation: Your answer is incorrect. The correct answer is Have a negative skew.
The histogram of the post-treatment scores for the control group has more scores on the right, or positive, end of the graph and fewer scores on the left, or negative, end of the graph. The distribution then "points" towards the negative end giving the scores a negative skew. A positive skew would be a histogram where the majority of the scores would be on the left, or more negative, end of the graph, and there would be few scores on the right, or positive, end.



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