Question

1. A psychologist would like to examine the relative effectiveness of three therapy techniques for treating mild phobias. A sample of N = 15 individuals who display a moderate fear of spiders is obtained. These individuals are randomly assigned (with n = 5) to each of the three therapies. The dependent variable is a measure of reported fear of spiders after therapy. The data are as follows:

Therapy A Therapy B Therapy C

(Drug Therapy) (Systematic Desensitization) (Implosive Therapy)

8 3 1

5 3 0 G = 45

5 0 1 ∑X^{2}
= 221

7 2 2

5 2 1

T = 30 T = 10 T = 5

SS = 8 SS = 6 SS = 2

a. Do the data indicate that there are any significant differences among the three samples?

Test at the .05 level of significance.

b. Use Tukey’s HSD posttest to determine exactly which treatments are different. Test at the

.05 level of significance.

2. First-born children tend to develop language skills faster than their younger siblings. One possible explanation for this phenomenon is that first-borns have undivided attention from their parents. If this explanation is correct, then it is also reasonable that twins should show slower language development than single children and that triplets should be even slower. The following hypothetical data demonstrate the relationship. The dependent variable is a measure of language skill at age three for each child. Do the data indicate any significant differences? Test with α = .05. Use the Scheffé test to determine which groups are different.

Single Child Twin Triplet

8 4 4

7 6 4

10 7 7

6 4 2

9 9 3

Answer #1

**The output of single anova factor is**

A psychologist would like to examine the effects of sugar
consumption on the activity level of preschool children. Three
samples of children are selected with n = 5 in each sample. One
group gets no sugar, one group gets a small dose, and the third
group gets a large dose. The psychologist records the activity
level for each child. The data from this experiment are presented
below.
No Sugar
Small Dose
Large Dose
M=3
SS=16
M=4
SS=12
M=5
SS=20
1)....

A clinical psychologist wanted to examine the relative
effectiveness of drug therapy and psychotherapy for depression
patients. A sample of 20 depression patients were randomly selected
and assigned to either of the two therapy methods. The data below
presents the effectiveness rated by independent judges. Can we
conclude that one method is better than the other at .05
significance level (non-directional)? Present assumptions and
hypotheses along with decision rules to test the null hypothesis.
(10 points) ** NOTE: DO NOT...

A psychologist would like to examine the effects of three
different testing methods on the final performance of college
students. One group gets regular quizzes, one group gets three
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sample of 10 students were assigned in each testing method
condition. At the end of the course, the psychologist interviews
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the material. Do these data indicate...

5. Measuring effect size for the repeated-measures
ANOVA
Alicia F. Lieberman and Patricia Van Horn have created a
psychotherapy model for young children who have witnessed family
violence. The therapy focuses on building the parent’s capacity to
nurture and protect the child, thereby promoting the child’s
emotional health and repairing the parent-child relationship, which
has been disrupted by the stress and trauma of family violence.
As a clinical psychology intern, you are learning parent-child
therapy with Drs. Lieberman and Van...

A clinic specializing in eating disorders would like to evaluate
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clinic to participate in a nutritional training program and 12
patients in the clinic with similar demographics who do not
participate in the nutritional program. Afterward, all participants...

please state in complete sentence
A researcher studied three computer keyboard designs. Three
samples of individuals were given material to type on a particular
keyboard, and the number of errors committed by each participant
was recorded. Are there significant differences in typing
performance among the three keyboard designs?
Keyboard A Keyboard
B Keyboard C
0
6
6
4
8 5
0 5
9
1
...

1a
The following data were obtained from an independent-measures
research study comparing three treatment conditions.
I
II
III
2
5
7
5
2
3
0
1
6
1
2
4
2
2
T =12
T =10
T =20
G = 42
SS =14
SS =9
SS =10
ΣX2= 182
Use an ANOVA with α = .05 to determine whether there are any
significant mean differences among the treatments.
The null hypothesis in words is
Group of answer choices
a. There...

A school counselor in a high school would like to try out a new
conflict-resolution program to reduce aggressiveness in students.
She first surveyed 16 students using a 20-item instrument to
measure their levels of aggression (on a scale of 0 to 10, with
higher numbers meaning higher aggression levels). One month after
the conflict resolution program was implemented, the students were
given the same survey. The data are listed in the table below. The
school counselor/researcher has set the...

A physician at the veterans’ hospital would like to try a new
MAOI (monoamine-oxidase inhibitor) drug for his veteran patients
diagnosed with PTSD. He wondered if MAOI would affect the frequency
of nightmares for this patient population. He first asked 16 of his
patients with PTSD to record each incident of a nightmare for 1
month before treatment. Participants were then given the MAOI
medication for 6 weeks, and then they were again asked to record
each occurrence of a...

B. Dr. Quisling, a child psychologist, investigates play
behavior in 4-year-olds. She is particularly interested in how
young girls develop ideas about the gender appropriateness of
certain toys. She conducts an experiment in which participants
(4-year old girls) first interact with an adult for 10 minutes in a
lab playroom. The adult models play for the child by interacting
with a female-stereotyped toy (a Barbie doll), a male-stereotyped
toy (a dump truck) or a gender-neutral toy (Legos). The children
are...

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