1. A research wants to study the relationship between Diastolic and Systolic blood pressure. In the study, they randomly selected 8 individuals who don't have any heart problems as the sample, and for each individual, their Diastolic and Systolic blood pressure are measured and recorded as below.

Diastolic (mmHg) x

73

84

86

87

67

78

80

75

Systolic (mmHg) y

121

134

142

145

121

132

135

139

To ease your calculation effort, the worksheet is provided below. Please complete the worksheet to find(xix)2

,(yiy)2,

and(xix)(yiy)

first.

(1) (3pts) Find the Least Square Regression equation for the linear relationship between the Systolic blood pressure and Diastolic blood pressure.(No points will be given without steps)

(2) (3pts) What percent of the variability of the data is explained by the regression equation you found from (1) ?(No points will be given without steps)