Assignment 2: Final Project
1. Use the appropriate descriptive statistics from W2: Assignment 2. Assuming that the
sample statistics you computed are exactly equivalent to the corresponding population
parameters, identify the following:
a. What score on the pretreatment Revised Children's Manifest Anxiety Scale
(RCMAS) would correspond to an extremely high score?
I will subjectively choose a z-score of 4 to represent extreme values.
20.22 + 4(3.74) = 35
b. What score on the pretreatment RCMAS would correspond to an extremely low
score?
20.22 - 4(3.74) = 5
2. Use SPSS to compute z-scores for Pretreatment RCMAS. Complete the table, indicating
the appropriate z-scores corresponding to each of the participants whose score is given.
Subject ID Pretreatment
Z-Score
RCMAS
5
20
(20  20.22) / 3.74  0.059
10
28
(28  20.22) / 3.74  2.080
15
24
(24  20.22) / 3.74  1.011
20
28
(28  20.22) / 3.74  2.080
25
17
(17  20.22) / 3.74  0.861
3. Write a brief paragraph interpreting these z-scores.
A pretreatment RCMAS of 20 is 0.059 standard deviations below the mean. A pretreatment
RCMAS of 28 is 2.080 standard deviations above the mean. A pretreatment RCMAS of 24 is
1.011 standard deviations above the mean. A pretreatment RCMAS of 17 is 0.861 standard
deviations below the mean.
This is from W2 Assignment 2
Statistics
N
Subjects
Subjects
Subjects Age in
RCMAS Pre-
RCMAS Post-
Years
treatment
Treatment
Valid
99
99
99
0
0
0
Mean
11.06
20.22
11.76
Median
11.00
19.00
12.00
10
18a
10a
Std. Deviation
1.504
3.740
5.363
Variance
2.262
13.991
28.757
Missing
Mode
a. Multiple modes exist. The smallest value is shown
Subjects RCMAS Pre-treatment
Cumulative
Frequency
Valid
Percent
Valid Percent
Percent
14
4
4.0
4.0
4.0
15
6
6.1
6.1
10.1
16
7
7.1
7.1
17.2
17
6
6.1
6.1
23.2
18
14
14.1
14.1
37.4
19
14
14.1
14.1
51.5
20
7
7.1
7.1
58.6
21
3
3.0
3.0
61.6
22
12
12.1
12.1
73.7
23
4
4.0
4.0
77.8
24
7
7.1
7.1
84.8
25
4
4.0
4.0
88.9
26
4
4.0
4.0
92.9
27
3
3.0
3.0
96.0
28
4
4.0
4.0
100.0
99
100.0
100.0
Total