In: Statistics and Probability
Age Group Midpoint |
Diastolic Blood Pressure |
5 |
60 |
7 |
63 |
9 |
69 |
11 |
74 |
13 |
75 |
15 |
71 |
17 |
77 |
19 |
85 |
21 |
78 |
a. Which of these variables - age group or blood pressure - are the independent and dependent variables?
Independent: Age ?
Dependent: Blood Pressure ?
b. Find the regression equation which best describes the relationship between these variables.
Y = a + bx?
c. Calculate the correlation coefficient for this regression equation for this sample.
Answer a)
Here, Independent variable x = Age and Dependent Variable y = Diastolic Blood Pressure
Answer b)
The equation of the regression line is: y = 56.086 + 1.258*x
Answer c)
The correlation coefficient for this regression equation for this sample is 0.8933