SAT考试将于2016年改革，SAT官方College Board于2015年1月9日释放新SAT考试最新样题，
Questions 3–5 refer to the following information.
The first metacarpal bone is located in the wrist. The scatterplot below shows the relationship between the length of the first metacarpal bone and height for 9 people. The line of best fit is also shown.
Which of the following is the best interpretation of the slope of the line of best fit in the context of this problem?
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正确答案：A
Choice A is correct. The slope is the change in the vertical distance divided by the change in the horizontal distance between any two points on a line. In this context, the change in the vertical distance is the change in the predicted height of a person, and the change in the horizontal distance is the change in the length of his or her first metacarpal bone. The unit rate, or slope, is the increase in predicted height for each increase of 1 centimeter of the first metacarpal bone.
Choice B is not the correct answer. Students who select this answer may have interpreted slope incorrectly as run over rise.
Choice C is not the correct answer. Students who select this answer may have mistaken slope for they-intercept.
Choice D is not the correct answer. Students who select this answer may have mistaken slope for thex-intercept.
Question Difficulty: EASY
Objective:
Students must interpret the meaning of the slope of the line of best fit in the context provided.