1. Describe the goals of computer/network security.

Confidentialityensures that computerrelated assets are accessed only by authorized
parties. That is, only those who should have access to something will actually get that
access.
Integritymeans that a
One
Introduction
1
1.1
O BJECTIVES
Here are some objectives of this course:
To appreciate statistics through analyzing data.
To solve real life problems through statistics.
To learn how to use statistical software to analyze data and interpret
computer
Two
SAS: An Introduction
24
2.1
W HAT IS SAS?
It is a programming language composed of statements that specify
how data is to be processed and analyzed.
A SAS program consists of a sequence of SAS statements grouped
together into blocks, referred to as
Three
R: An Introduction
60
3.1
W HAT IS R?
It is an integrated suite of software facilitates for data manipulation, calculation and graphical display. Among other things it has
An effective data handling and storage facility;
A suite of operators for c
Six
Robust Statistics for
Location and Scale
Parameters
212
6.1
W HY DO WE NEED R OBUST S TATISTICS ?
There may be outliers in the data.
Outliers are sample values that are considered very different from
the majority of the sample.
The data may depart f
Five
Describing Numerical
Data
133
5.1
I NTRODUCTION
There are two major ways of describing numerical data:
Numerical descriptive measures
Location
Variability
Other measures
Graphical methods
Histogram
Boxplot, Stem and leaf plot
Scatter plot for
Four
SPSS: An Introduction
102
4.1
W HAT IS SPSS?
Statistical Package for Social Sciences.
It is an interactive userfriendly statistical package.
It comprises of two parts
Data editor creating and modifying data sets;
Statistical procedures analyzin
Seven
Analyzing Categorical
Data
233
7.1
W HAT IS A C ATEGORICAL VARIABLE ?
Examples:
Gender (Male" or Female").
Sick or well.
Success or failure.
Age group (Below 20", 20 to below 40", 40 to below 60", 60 and
above").
234
Common Techniques used to an
Eight
One Sample Tests and
Two Sample Tests
293
8.1
O NE S AMPLE T EST FOR THE LOCATION
Parametric test
One sample ttest (normal populations)
Nonparametric tests
Sign test
Sign rank test
294
Testing H0 : = 0
The data set teabag.txt consists of the