Researcher is interested in the relationship between sodium intake (mmol/d) and systolic blood pressure (SBP- mmHg). In a pilot study, he collected data on 12 subjects which were

recorded in the table below:

Subject

1

2

3

4

5

6

7

8

9

10

11

12

Sodium

intake

6.8 7.0

6.9 7.2 7.3 7.0 7.0 7.5 7.3 7.1 6.5

6.4

SBP

154 167 162 175 190 158 166 195 189 186 148 140

(i) Draw the scatter diagram for the data.

(ii) Compute a statistic to show the relationship between the sodium intake and systolic blood

pressure.

(iii) Comment of your result in (i) above

(iv) Calculate the coefficient of determination and interpret it.​