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Psychology 21500
Take Home Exam 3 (Chapters 13  16)
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1.
The null hypothesis for an ANOVA states that _____.
a.
there are no differences between any of the population means
b.
at least one of the population means is different from the others
c.
all of the population means are different from each other
d.
None of the other 3 choices is correct.
____
2.
If the null hypothesis is true and there is no treatment effect, what value is expected on average for the F
ratio?
a.
0
b.
1.00
c.
k – 1
d.
N – k
____
3.
In general the distribution of Fratios is _____.
a.
symmetrical with a mean of zero
b.
positively skewed with all values greater than or equal to zero
c.
negatively skewed with all values greater than or equal to zero
d.
symmetrical with a mean equal to
df
between
____
4.
In analysis of variance,
MS
provides a measure of _____.
a.
Variance
b.
average differences among means
c.
the total variability for the set of N scores
d.
the overall mean for the set of N scores
____
5.
In the notation for ANOVA, what is referred to by the letters n and N?
a.
n is the number of scores in each treatment and N is the number of scores in the entire
study.
b.
N is the number of scores in each treatment and n is the number of scores in the entire
study.
c.
n is the number of scores in each treatment but N is not used in the notation for ANOVA.
d.
N is the number of scores in the entire study but n is not used in the notation for ANOA.
____
6.
In analysis of variance, the Fratio is a ratio of _____.
a.
sample means
b.
sample means divided by variances
c.
two variances
d.
sample variances divided by sample means
____
7.
In an analysis of variance, which of the following is directly influenced by the size of the sample mean
differences?
a.
SS
between
b.
SS
within
c.
SS
total
d.
All three
SS
values are influenced.
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8.
In an analysis of variance, which of the following is directly influenced by the size of the sample variances?
a.
SS
between
b.
SS
within
c.
SS
total
d.
All three
SS
values are influenced.
____
9.
In general, what factors will produce the largest Fratio?
a.
small mean differences and small variances
b.
small mean differences and large variances
c.
large mean differences and small variances
d.
large mean differences and large variances
____
10.
An analysis of variance is used to evaluate the mean differences for a research study comparing four
treatments with a separate sample of
n =
5 in each treatment. If the data produce an Fratio of
F =
3.15, then
which of the following is the correct statistical decision?
a.
Reject the null hypothesis with
a =
.05 but not with
a =
.01.
b.
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 Spring '09
 isaac
 Psychology

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