15 The scatterplot shows the relationship between x and y. A line of best fit is also shown. Which of the following is closest to the slope of this line of best fit?
Correct answer: A (parsed from the explanation — this source omits an answer key for this item)
Explanation
, Choice A is correct. A line in the xy-plane that passes through the points ^x1 y1 h and ^x2 , y2 h has a slope of y x 2 2 - - y x1 1 . The lin 0 e , 3 o . f 2 best fit 2 s , h 4 o .4 wn passes through the points with approximate coordinates ^ h and ^ h. It follows that the slope 4.4-3.2 1.2 0.6 of the line of best fit is approximately 2-0 , which is equivalent to 2 , or . 0.6 Therefore, of the given choices, is closest to the slope of the line of best fit shown. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors. Choice D is incorrect and may result from conceptual or calculation errors.
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