Psych 541 Quiz 5 Summer 2017
47 points
1. IfSST
= 56 andSSB = 14,SSW = _________.
a. 34
b. 6
c. -6
d. 42
2. If dfB = 4 and dfW
= 20, usingalpha = 0.05,Fcrit
= _________.
a. 2.87
b. 3.10
c. 3.74
d. 6.22
3. An investigator conducts
an experiment involving the effects of three levels of a drug on memory.
Subjects are randomly assigned to one of three conditions. A different drug
level is administered in each condition. Memory is measured 10 minutes after
each subject receives the drug. The following scores are recorded. The higher
the score, the better the memory.
Drug Level one two three
6 9 14
5 7 13
8 9 15
2 13 19
After conducting a one-way
ANOVA of the above data, which of the following is the variability among the
group means _________.
a. 6.50
b. 15.5
c. 100.75
d. 201.5
4. Refer to the drug study. After conducting a
one-way ANOVA of the above data, which of the following is the average variance
within each of the three groups.
a. 6.50
b. 15.5
c. 100.75
d. 201.5
5. Refer to
the drug study. After conducting a one-way ANOVA of the above data, which of
the following is the F critical using alpha at .05.
a. 3.63
b. 4.26
c. 5.12
d. 4.46
6. If I
have four groups, and a total of 40 subjects in the entire experiment, how many
within groups degrees of freedom do I have.
a. 39
b. 3
c. 36
d. 28
7. Refer to the drug study. When calculating the
total sum of squares, I utilize the following expression: SStotal = 1460 –
(120)2/12 which equals 260. The SS between = (21)2/4 +
(38)2/4 + (61)2/4
– (120)2/12 which
equals 201.5. Based on this information which of the following is the numerator
of the average variance within each group.
a. 1460
b. 201.5
c. 120
d. 58.5
8. Refer
to the drug study. When calculating the total sum of squares, I utilize the
following expression: SStotal = 1460 – (120)2/12 which equals 260.
The SS between = (21)2 + (38)2 + (61)2– (120)2/12
which equals 201.5. Based on this
information which of the following is the numerator of the total variance among
all the scores.
a. 1460
b. 201.5
c. 120
d. 260.
9. Refer to the drug study Estimate the size
of the effect.Using
omega squared.
a. 0.5109
b. 0.6698
c. 1.6633
d. 0.7073
10. Refer to drug study. Estimate the size of the effect using
Cohen’s f.
a. 1.4244
b. 0.6698
c. 1.6633
d. 1.5546
11. (12 points) In the space below conduct
pairwise comparisons using the Tukey, Neuman Keuls, LSD and Bonferroni for the
drug study above. Place the work for each test (show all work) below the label
for each test and be specific when you state you conclusions.
(3 points) Tukey
test (show all work for Tukey below)
(3 points) Neuman
Keuls (show all work for Neuman Keuls below)
( 3 points) LSD
(show all work for LSD below)
(3 points) Bonferroni
(show all work for Bonferroni below)
11.
A sleep researcher conducts an experiment to determine whether sleep loss
affects the ability to maintain sustained attention. Fifteen individuals are randomly divided into
the following three groups of 5 subjects each: group 1, which gets the normal
amount of sleep (7-8 hours); group 2, which is sleep-deprived for 24 hours;
group 3, which is sleep-deprived for 48 hour. And group 4 which is sleep
deprived for 72 hours. All four groups
are tested on same auditory vigilance task.
Subjects are presented with half-second tones spaced at irregular
intervals over a 1-hour duration.
Occasionally, one of the tones is slightly shorter than the rest. The subject’s task is to detect the shorter
tones. The following percentages of
correct detections were observed:
Normal
Sleep-Deprived Sleep-Deprived Sleep Deprived
Sleep for
24 Hours for 48 Hours for 72 Hours
85 60 60 55
83 58 48 47
76 76 38 27
64 52 47 41
75 63 50 43
After conducting a one way ANOVA, which of the
following is theSSBetween?
a. 3422.4
b. 2234.4
c. 96.555
d. 1953.3
12. Refer to the sleep
study.SSW =
_________.
a. 3422.4
b. 2234.4
c. 96.555
d. 1256.4
13. Refer to the sleep study.
Fobt = _________.
a. 20.99
b. 10.99
c. 14.528
d. 3.24
14. Refer to the sleep study.
Based on the F obtained which of the
following below is the amount of variability among the means expected by
chance.
a. 1140.8
b. 78.525
c. 3422
d. 3255
15.Refer to the sleep study.
Usingaplha = 0.05,Fcrit
= _________.
a. 4.33
b. 3.63
c. 2.96
d. 3.24
16. Refer to the sleep
study. Usingalpha = 0.05, what do you conclude?
a. rejectH0;
sleep deprivation has the same effect on
vigilance at all levels
b. rejectH0;
sleep deprivation does not have the same
effect on vigilance at all levels
c. retainH0;
we cannot conclude that sleep deprivation influences vigilance
d. acceptH0;
sleep deprivation has the same effect on
vigilance at all levels
17. Refer
to sleep study Estimate the size of the effect.Using omega squared.
a. 0.5109
b. 0.6698
c. 1.6633
d. 0..5678
18. Refer to sleep study. Estimate the size of the effect using
Cohen’s f.
a. 1.4244
b. 0.6698
c. 1.6633
d. 0.5678
19.
If the variability of the cell means around the grand mean is no greater than
you would
expect
by chance, then you would expect your F ratio to be equal to ?
a.
10
b. 0
c.
2.34
d.
1.00
20. Which of the following would cause Fobtainedto increase?
a. an increase in the difference between the means
b. an increase in the within-groups variability
c. an increase in the magnitude of the independent variable’s effect
d. a and b
e. a and c
21.
Which of the following assumptions of the analysis of variance if violated is especially problematic if you have unequal
sample sizes.
a.
normality
b.
homogeneity of variance
c.
independence
d.
odd numbers
22. TheF ratio
increases as _________.
a. the variability between
means increases relative to the variability within groups
b. the variability between
means decreases relative to the variability within groups
c. the total variability
increases
d. the total variability
decreases
e. the variability within
groups remains the same
23. Which of the follow
will result if you violate the assumptions of the F test, especially if you
have heterogeneity of variance and unequal n?
a) Power will decrease
b) Probability of a type 2
error will increase
c) Probability of a type 1
error will increase
d) The world will end
24.(12 points)In the space below conduct pairwise
comparisons using the Tukey, Neuman Keuls, LSD and Bonferroni for the sleep study
above. Place the work for each test (show all work) below the label for each
test and be specific when you state you conclusions.
(3 points) Tukey
test (show all work for Tukey below)
(3 points) Neuman
Keuls (show all work for Neuman Keuls below)
(3 points) LSD
(show all work for LSD below)
(3 points) Bonferroni
(show all work for LSD below)
