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Below in green is the graph and data given for this exercise. In red are the questions and my answers are in blue. I am
Below in green is the graph and data given for this exercise. In red are the questions and my answers are in blue. I am worried that my answers are incorrect. Could you please review and provide feedback? Prediction: Y' (Y Prime) from X x =45, y = 60, Sx - 20, Sy - 15, Ixy =- 0.68 Box A: mean plus 2 standard deviations, B: mean of the variable on vertical axis, C: mean minus one standard deviation. D: mean minus 2 standard deviations, E: mean, F: mean plus 2 standard deviations. Question 1: What values do you put in the letter boxes: A: y + 2(Sy) =60+2(15) =90. B: 60. C: 30. D: x - Sx - 45 -2(20) - 5, E: 45, F: 85. Question 2: If a negative correlation exists, the slope of regression line moves up, down, or horizontally? Down Question 3: Find the regression line equation. I used the formula y = a + bX and I assume that b= Isy = - 0.68. So, I guess that a = y - bX. However, not sure what X and y would be at this moment so I used the means which I don't know make sense. a 60-(-0.68)(45) -90.6. So my regression line would be y =90.6-0.68X. Question 4: Looking at your first predicted point (left most point) what is the given value and the predicted value? Given value is 5, predicted value is 90.6-0.68(5) -87.2:This is assuming that answer to Q3 is right. Questions 5: A last question for the person helping me here: I assumed that Y prime is the same as y hat or #predicted variable. Is that right
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