Page 195 - Quantitative Data Analysis

Quantitative Data Analysis
Simply Explained Using SPSS

Unit Exercises

A blood specialist is studying the effects of cadmium and zinc levels
in blood. The following regression equation is used: ̂
. Treat cadmium at the independent variable and zinc as the
dependent variable; both variables have units ppm/g ash. Use this
to answer questions 6 and 7.

1. For every one unit increase in cadmium, zinc level is
predicted to
a. Increase 2.05 units
b. Decrease 2.05 units
c. Increase 14.56 units
d. Decrease 14.56 units

2. What is the predicted zinc measure for a person with 45
ppm/g ash of cadmium?
a. 77.69
b. 106.81
c. 653.15
d. 657.25

3. If r = 0.8. then the Co-efficient of Determination is equal
to –
a. 0.80
b. 0.89
c. 0.64
d. 89%

4. If the coefficient of determination is +0.81, the correlation
coefficient

The Theory and Applications of Statistical Inferences 179