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5) Compute the correlation coefficient and regression equation for Ponderal index (x) and systolic blood pressure (y). n = 100, ? x = 13,010, ? y = 4,052, ? x² = 1,736,990, ? xy = 527,185, ? y² = 164,521. 6) In a study of systolic blood pressure (SBP) in relation to whole blood cadmium (Cd) and zinc (Zn) levels the following data were obtained Cd (ppm/g ash) | 68 | 63 | 56 | 48 | 96 | 70 | 66 Zn (ppm/g ash) | 127 | 118 | 78 | 76 | 181 | 134 | 122 SBP (mmHg) | 166 | 162 | 116 | 120 | 160 | 120 | 182 a- Make a scatter diagram of cadmium and systolic blood pressure, using the later as the dependent variable. b- Judging from the diagram, would you be justified in using linear regression analysis to determine a line of best fit for cadmium and blood pressure? Why or why not? c- Compute the correlation coefficient for cadmium and blood pressure. d- Using zinc as the dependent variable, plot the scatter diagram of cadmium and zinc. e- Does the diagram of (d) provide justification for using regression analysis to determine a line of best fit? f- Calculate the equation of the line on the scatter diagram for d.

          5) Compute the correlation coefficient and regression equation for Ponderal index (x) and systolic blood pressure (y).
n = 100, ? x = 13,010, ? y = 4,052, ? x² = 1,736,990, ? xy = 527,185,
? y² = 164,521.

6) In a study of systolic blood pressure (SBP) in relation to whole blood cadmium (Cd) and zinc (Zn) levels the following data were obtained
Cd (ppm/g ash) | 68 | 63 | 56 | 48 | 96 | 70 | 66
Zn (ppm/g ash) | 127 | 118 | 78 | 76 | 181 | 134 | 122
SBP (mmHg) | 166 | 162 | 116 | 120 | 160 | 120 | 182
a- Make a scatter diagram of cadmium and systolic blood pressure, using the later as the dependent variable.
b- Judging from the diagram, would you be justified in using linear regression analysis to determine a line of best fit for cadmium and blood pressure? Why or why not?
c- Compute the correlation coefficient for cadmium and blood pressure.
d- Using zinc as the dependent variable, plot the scatter diagram of cadmium and zinc.
e- Does the diagram of (d) provide justification for using regression analysis to determine a line of best fit?
f- Calculate the equation of the line on the scatter diagram for d.

5) Compute the correlation coefficient and regression equation for Ponderal index (x) and systolic blood pressure (y).
n = 100, ? x = 13,010, ? y = 4,052, ? x² = 1,736,990, ? xy = 527,185,
? y² = 164,521.

6) In a study of systolic blood pressure (SBP) in relation to whole blood cadmium (Cd) and zinc (Zn) levels the following data were obtained
Cd (ppm/g ash) | 68 | 63 | 56 | 48 | 96 | 70 | 66
Zn (ppm/g ash) | 127 | 118 | 78 | 76 | 181 | 134 | 122
SBP (mmHg) | 166 | 162 | 116 | 120 | 160 | 120 | 182
a- Make a scatter diagram of cadmium and systolic blood pressure, using the later as the dependent variable.
b- Judging from the diagram, would you be justified in using linear regression analysis to determine a line of best fit for cadmium and blood pressure? Why or why not?
c- Compute the correlation coefficient for cadmium and blood pressure.
d- Using zinc as the dependent variable, plot the scatter diagram of cadmium and zinc.
e- Does the diagram of (d) provide justification for using regression analysis to determine a line of best fit?
f- Calculate the equation of the line on the scatter diagram for d.

Added by Andrea E.

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