Question

please help.

2 to place and Say - for i and F to twe deimal places. Round your anowers for a and b to three demal places)

Answer 1

a) Draw a scatter diagram displaying the data.

Answer:

60 ך 50 40 20 10 0 0 3 4 5 7

b)

$\sum x=13$

$\sum y=151$

$\sum x^{2}=65$

$\sum y^{2}=6047$

$\sum xy=403$

$r=-0.988$

c.

$\bar{x}=3.25$

$\bar{y}=37.75$

$\hat{y}=50.286+(-3.857)x$

35 50 4 5 4D 35 30 25 20 30 45 40 SD 25 20 13p 50 13 35 35 30 23 23

e)

$r^{2}=0.976$

$explained=97.6\%$

$un-explained=2.4\%$

(f)

$\hat{y}=50.286+(-3.857) \times 3$

$=50.286-11.571$

$=38.72$%