Question

Use the given data to find the equation of the regression line. Round the final values to two decimal places.

Table 5

x	1.1	1.5	1.4	1.1	1.2
Y	60	61	63	62	59

Answer 1

Equation of Regression line

'a' indicates the value of y when x=0. It is called Y-intercept
'b' indicates the slope of the regression line and gives a measure of change of 'y' for a unit change in 'x'

n : Number of pairs of (x,y) = 5

x	y	xy	x2
1.1	60	66	1.21
1.5	61	91.5	2.25
1.4	63	88.2	1.96
1.1	62	68.2	1.21
1.2	59	70.8	1.44

b = 3.0303

Equation of the regression line