Explanation for Question 4 From the Math (Calc) Section on the 2020 March Sat
And question number four, we're told that there are 10 data points on the 2 scatter plot above and a line of best fit, 3 right? So here are our scatterplots each of the individual dots. 4 And then the line of best fit is a line that's not exactly from 5 the data, right? But it kind of describes the trend of the data. 6 So you can see in a general idea where each of the points line 7 up and how they relate to each other. And the question asks us, 8 which of the following best estimates, the predicted value of Y when X is 9 equal to 6.5. So we're looking at an X of 6.5. 10 So let's go ahead and look where 6.5 would be. 11 That would be right about here on the X axis. 12 And we're looking for the predicted value, 13 which basically means that we can use the trend line, 14 the line of best fit to figure out what that line would predict as 15 the value. And then from there use that Y coordinate. 16 And so if I go up until I hit my trend line at 6.5, 17 I see that happens at a Y value of about 16 at 16 is 18 also in my answer choice. And so our best answer is going to be 19 D because if you were to find 6.5 on our trend line or 20 a line of best fit, it would show you 16 rather than the other 21 numbers.