# Question: a By hand draw a scatter diagram treating x as

(a) By hand, draw a scatter diagram treating x as the explanatory variable and y as the response variable.

(b) Select two points from the scatter diagram and ﬁnd the equation of the line containing the points selected.

(c) Graph the line found in part (b) on the scatter diagram.

(d) By hand, determine the least-squares regression line.

(e) Graph the least-squares regression line on the scatter diagram.

(f) Compute the sum of the squared residuals for the line found in part (b).

(g) Compute the sum of the squared residuals for the least-squares regression line found in part (d).

(h) Comment on the ﬁt of the line found in part (b) versus the least-squares regression line found in part (d).

(b) Select two points from the scatter diagram and ﬁnd the equation of the line containing the points selected.

(c) Graph the line found in part (b) on the scatter diagram.

(d) By hand, determine the least-squares regression line.

(e) Graph the least-squares regression line on the scatter diagram.

(f) Compute the sum of the squared residuals for the line found in part (b).

(g) Compute the sum of the squared residuals for the least-squares regression line found in part (d).

(h) Comment on the ﬁt of the line found in part (b) versus the least-squares regression line found in part (d).

## Answer to relevant Questions

(a) By hand, draw a scatter diagram treating x as the explanatory variable and y as the response variable. (b) Select two points from the scatter diagram and ﬁnd the equation of the line containing the points selected. (c) ...The following data represent commute times (in minutes) and score on a well-being survey. Commute Time Gallup-Healthways Well-Being (minutes), x ....... Index Composite Score, y 5 .......... 69.2 15 .......... 68.3 25 ...The following data represent the number of days absent, x, and the ﬁnal grade, y, for a sample of college students in a general education course at a large state university. (a) Find the least-squares regression line ...Use the linear correlation coefﬁcient given to determine the coefﬁcient of determination, R2. Interpret each R2. (a) r = -0.32 (b) r = 0.13 (c) r = 0.40 (d) r = 0.93 In Section 3.2, we introduced one measure of risk used by ﬁnancial analysts, the standard deviation of rate of return. In this problem we will learn about a second measure of risk of a stock, the beta of a stock. The ...Post your question