A general aptitude test correlates .45 with success in a particular college. To improve the predictive accuracy, the students are also given three other aptitude measures, all of which correlate very highly with one another and with the first test. What will be the likely effect of adding the scores from the three additional tests to the regression equation?
a. Predictive accuracy will significantly improve.
b. Only a very small improvement will occur.
c. Predictive accuracy will decrease slightly.
d. Cannot estimate from the information given.
Question 2
A scattergram is helpful because it illustrates the
a. magnitude of the relationship between two variables.
b. direction (+ or -) of a relationship between two variables.
c. presence of a nonlinear relationship between two variables.
d. All of these are true.
e. a and b
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