Imagine a researcher wanted to investigate whether

6. Imagine a researcher wanted to investigate whether there was a significant correlation between IQ
and annual income, but she had reason to believe that work ethic would influence both of these
variables. What should she do?
a. Conduct a partial correlation to look at the relationship between IQ and annual income while
partialling out the effect of work ethic.
b. Conduct a semi-partial correlation to look at the relationship between IQ and annual income while
partialling out the effect of work ethic.
c. Conduct a partial correlation to look at the relationship between work ethic and annual income
partialling out the effect of IQ.
d. Conduct a semi-partial correlation to look at the relationship between IQ and work ethic while
partialling out the effect of annual income.
Ans: A
7. A correlation of .5 would produce a scatterplot in which the slope:
8. The table below contains scores from six people on two different scales that measure attitudes
towards reality TV shows.
Attitudes towards Watching Reality TV
Scale
The General Reality TV Scale
3 2
7 5
4 3
1 1
8 7
6 7
Using the scores above, the two scales are likely to:

9. The table below contains scores from six people on two different scales that measure attitudes
towards reality TV shows.
Attitudes towards Watching Reality TV
Scale
The General Reality TV Scale
3 2
7 5
4 3
1 1
8 7
6 7
Based on intuition rather than computation, which of the following is the value of the correlation
coefficient between the two scales?