psy355 SPSS Cumulative Assessment

SPSS Cumulative Assessment Instructions
The following research questions can be answered using 1 of
the 5 tests you have learned so far: single-sample t-test, paired-samples t-test,
independent-samples t-test, one-way
ANOVA, or two-way ANOVA. Use the information in the tables to construct your
SPSS data file, just as you have been doing in Part 2 of each homework
assignment. There is only 1 correct
choice of analysis for each question. The assessment is open-book/open-notes.

For each problem involving a test of significance, your
answer must include: A) the output and
an appropriate graph from SPSS; B) a
statistical statement (i.e., t(19) = 1.79, p = .049); and C) a sentence summarizing the results (i.e., “There was a
significant difference between the two groups on the variable…” or “There was
no significant difference…”).

For ANOVA problems:
Report statistical findings and make statements for all main effects and
interaction effects. Use the Fisher LSD test for any analyses requiring post
hoc tests.

Submit this assignment by 11:59 p.m. (ET) on Monday of
Module/Week 5.

1. An
entrepreneur claims that he has developed a program that can increase the IQ of
adolescent students. To test this claim, a psychologist administers the WISC
(an IQ score for children) to a group of students before and after completing
the training program. Analyze the data to test the entrepreneur’s claim. (16
pts)

Student

IQ before

IQ after

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

103
85
94
106
74
98
83
93
103
96
109
115
86
122
112
126
118
72

99
89
90
108
74
99
80
99
107
93
111
117
83
122
120
131
116
74

2. The
staff at a local psychiatric facility wants to determine whether implementing a
No Smoking rule significantly decreases the length of stay of inpatients. In
order to test this claim, they compared the length of stay of patients admitted
before a No Smoking rule was implemented to another group of patients admitted after
the No Smoking rule was implemented. Evaluate the claim that the average length
of stay was significantly shorter for the group admitted after the facility implemented
the rule. (16 pts)

Smoking Allowed

No Smoking

8
5
2
5
8
6
4
14

7
15
12
8
4
13
10
8

5
10
7
8
2
3
2
4

4
8
4
5
2
4
6
7

3. Depressed
patients are randomly assigned to 1 of 3 therapists. At the end of 3 months,
each patient completes a standardized test of depression (higher scores
indicate higher level of depression). The patients’ scores are shown below. Analyze
the data to determine how effective these 3 therapists are at treating
depression (assume that before the treatment, all 3 groups of patients had the
same average depression score). (16 pts)

Therapist 1

Therapist 2

Therapist 3

35
37
35
37
36
33
39

36
37
37
31
39
35
32

29
32
25
28
33
30
32

4. In
light of all the weight loss misinformation and fad diets, a medical researcher
determines to evaluate several of them. She randomly assigns volunteers (identified
as clinically obese) to 1 of 4 diets. She is a firm believer in the benefits of
exercise, so she also assigns them to either the exercise or no exercise group.
After 3 months, she compares the pounds lost for each condition. Was there a
significant effect of the diets and exercise on weight loss? (16 pts)

Exercise

Low Carb

South Beach

Adkins

Weight
Watchers

26
28
30
25
20

28
22
18

25
21
24
29

28
28
30
25
26

No
Exercise

15
20
18

18
12
15
15

17
19
28
25
21

34
25
30
28

5. Infants
exposed to cocaine in their mother’s womb are thought to be at high risk for
major birth defects. Thirteen infants born to mothers who are addicted to
cocaine are administered the Brazelton Neonatal Assessment 1 day after birth.
For these babies, their scores were as follows:

Brazelton Scores

6.25
4.50
8.50
5.50
3.00
7.90
7.50
5.30
6.80
7.50
5.25
7.45
6.80

For the general population, babies normally score an 8.5. Is
this group of babies significantly lower than normal? (16 pts)