Percent Per Standard Unit
Normal Curve
45
40
35
30
25
20
15
10
5
0
-4
-3
-2
-1
0
1
2
STANDARD UNITS
3
4
68% of cases : -1 to 1 standard units from the mean
95% of cases : -2 to 2 stan
The Effects of Stress on Schizophrenia
Onset
Aaron Centeno
An Introduction
Schizophrenia:
The first symptoms are subtle, such as irritability, abnormal sleep schedule, or a drop in
grades, and onset is often triggered by a highly stressful event.
Typicall
Summariza(on of Data
Frequency Distribu(ons
Tabular Representa(on
Graphical Representa(on
The rst step in understanding a data set is to summarize the data
Frequency distribu(ons are a common way to summari
Correla'on
Sca,er diagrams used to graphically represent the rela'onship
between two variables
14
x y
1 5 12
3 9
10
4 7
y 8
5 1
6
7 13
4
2
0
0
2
4
x
6
8
Posi've
1) D - The others either lack the encompassing attributes necessary to accurately convey the
average and its standard deviation of 15, such as B, which has the correct averages but incorrect
standard deviations, or have inaccurate standard deviations and/
Psychology 391 Junior Honors
SPSS Assignment 3
Files you will need:
Psych391_SPSS_Assignment2_DATA.sav
Open this file in SPSS and use the data in the file to complete items 1-3 below.
This data set includes data on lodging and dining expenses for 12 busin
Aaron Centeno
September 18, 2012
Chapter 3 CRE
2. (a) age 1
(b) age 21
(c) age 0-4
(d) 50%
5. The question says between 90,000 and 100,000, so I would assume that is (in thousands)91,
92, 93.98, 99. That would be 9%. However, if 90,000 and 100,000 were to
Aaron Centeno
November 14, 2012
Outline
Topic will be determining likelihood of schizophrenia onset via genetic and
environmental factors
Brief discussion of limiting factors in the study of schizophrenia
What previous research has found on factors of inc
Psychology 391 Junior Honors
SPSS Assignment 1
Files you will need:
Psych391_SPSS_Assignment1_DATA.sav
Open this file in SPSS and use the data in the file to complete items 1-4 below.
A researcher is interested in the relationship between quality of teach
1. r = .709
2. Mean X = 226.75
Mean Y = 131.5 SDx = 90.04 SDy = 55.51
19920+105050+36750+36900+43750+12600+12240+51300+33150+13900+24000+7250 =
396810
396810/12=33067.5
CovXY = 33067.5 - (226.75*131.5) = 3249.875
r = 3249.875/(90.04*55.51)
r = .65
The two
GET
FILE='C:\Users\Aaron\Desktop\Downloads\Psych391_SPSS_Assignment2_DATA.sav'.
>Warning. Command name: GET FILE
>SPSS Statistics data file "C:\Users\Aaron\Desktop\Downloads\Psych391_SPSS_Assignment2_DATA.sav" is written in a character encoding (ISO_8859
Tes$ng Mean Dierences with t-tests
One sample t-test
Independent samples t-test
Paired (dependent) samples t-test
One-sample t-test : Does the mean for a single variable dier from
some pre-determined amount.