For the 15 colleges shown, the graph supports which of the following s

Question

GRE cluster.jpg On the above diagram, each of fifteen private colleges is represented by a circle and a dot. The light green circle, read against the green scale on the left, gives the college's annual gross tuition income in 2008; the data point is the very center of the circle. The black dot, directly above or below the center of the green circle and read against the right scale, gives the college's annual income in 2008 from investments such as endowments . For the 15 colleges shown, the graph supports which of the following statements I. tuition income is positively correlated with student enrollment II. investment income is negatively correlated with student enrollment III. all colleges with over 20,000 student have less than $500 million in investment income The options are following A. I only B. I and II only C. I and III only D. II and III only E. I, II, and III

MalachiKeti · Answer

Hi, why is the third incorrect  carcass

Carcass · Answer

Statement I: As we move across from left to right, student enrollment increases, and the green dots, tuition income, clearly go up. As one goes up, the other goes up. We can find individual dot exceptions, but this is the overall pattern of all the green dots together. That's a positive correlation. Therefore, tuition income is positively correlated with student enrollment. The graph supports I.

Statement II: As we move across from right to left, student enrollment increases, and the red dots go down--as one increases, the other decreases. We can find individual dot exceptions, but this is the overall pattern of all the red dots together. That's a negative correlation. Therefore, investment income is negatively correlated with student enrollment. The graph supports II.

Statement III: At the dot 20 on the horizontal scale, which represents 20,000 students, imagine a vertical line--we are considering all colleges to the right of that line. For investment income, we are looking at red dots. Six of the seven red dots are below the $500 million line, but one dot, the college with approximately 22,000 students, has an investment income of $570 million. Therefore, we can't say all these schools have investment income of less than $500 million.

The graph does not support III. The graph supports I & II only. Answer = (B)

For the 15 colleges shown, the graph supports which of the following s

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For the 15 colleges shown, the graph supports which of the following s

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