1
PSC 41 – Fall 2007
Name
Exam 2  FORM A
ID#
Instructions:
There are 45 multiplechoice questions. Read each question and the possible
answer choices carefully
. Choose the single BEST response for each item. Fill in the appropriate
bubble on your UCD2000 scantron answer sheet with a No.2 pencil.
1.
To obtain the variance, which = (
Σ
(x 
x)
2
/(N1), the
a.
sum of squared deviations is divided by the degrees of freedom.
b.
sum of squared deviations is divided by the number of scores.
c.
standard deviation is divided by the degrees of freedom.
d.
standard deviation is divided by the number of scores.
2.
A researcher needs to pick five people of differing IQ levels. Their IQs must add up to 550, the first
must be 95 and the third must be 140. The number of degrees of freedom would be
a.
5
b.
4
c.
3
d.
2
3.
If a perfect positive relationship between two variables exists, as one variable
a.
increases, the other variable will increase by a predictable amount.
b.
decreases, the other variable will decrease by a predictable amount.
c.
increases, the other variable will decrease by a predictable amount.
d.
both A and B
4.
A researcher wants to measure the relationship between age and score (two continuous variables) on
this test. The most appropriate statistic would be the
a.
Spearman rankorder correlation.
b.
sign test.
c.
Pearson productmoment correlation.
d.
repeated measures ANOVA.
5.
A researcher found that short people did well in research methods and tall people did poorly, with
people of average height scoring in the middle. The relationship between height and grade in
research methods is a
a.
positive correlation.
b.
negative correlation.
c.
nonlinear relationship.
d.
curvilinear relationship.
6.
If you wanted to quantify the degree of relationship between academic achievement and creativity,
which correlation coefficient would you want to use?
a.
Pearson productmoment correlation
b.
Spearman rankorder correlation
c.
Either would be appropriate.
d.
It would depend on how the variables were measured.
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7.
Which correlation represents the strongest relationship?
a.
+.37
b.
+.68
c.
.02
d.
.73
8.
The Pearson productmoment correlation is an index of what type of relationship between two
variables?
a.
circular
b.
linear
c.
parabolic
d.
curvilinear
9.
From left to right, the above distributions are
a.
vertically skewed, skewed right, skewed left.
b.
symmetrical, negatively skewed, positively skewed.
c.
vertically skewed, positively skewed, negatively skewed.
d.
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 Spring '07
 Nitzberg
 Statistics, Standard Deviation, researcher, Correlation and dependence, Pearson productmoment correlation coefficient, Spearman's rank correlation coefficient

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