1. S519: Evaluation of Information Systems
Social Statistics
Ch1: Introduction

2. Social Statistics
Statistics describes a set of tools and techniques for describing, organizing and interpreting information or data.
Do we need statistics? When and Why?

3. Descriptive statistics
Used to organize and describe the characteristics of a collection of data

4. Descriptive statistics
Name
Gender
Major
Age
Score
Sara
Female
LIS 27 A
Richard
Male
Psychology 30 C
Andrea
Education 33 B
Emily
Language 25
Bill 28
Leo 26
Liz
Alice
Steven 24
Jeff
How can you describe this table?

5. Inferential statistics
Make inferences from a smaller group of data to a possible larger one
Sample: a smaller group of data
Population: the whole group of a certain subject
What can you infer from above table?

6. Excel and Add-in Excel 2003, 97 Analysis ToolPak
Lab
Excel 2003, 97
Analysis ToolPak
Tools menu, click add-ins
In add-ins box, select the checkbox of analysis toolpak, click ok
Install it
Then you are done!
You see „data analysis“ under Data menu

7. Why learn statistics Always good to put some lines in your vita
It is an important way of analysing data
You need this for your evaluation

8. Formula Lab Operator Symbol Example What it does Addition + =2+5
Adds 2 and 5
Subtraction -
=5-3
Subtracts 3 from 5
Division /
=10/5
Divides 10 by 5
Multiplication *
=2*5
Multiplies 2 times 5
Power of ^
=4^2
4 power of 2
How does it work in Excel?

9. Function
Lab
Sum()
=sum(3,4)
=sum(a2:a4)
=sum(a2:a4, 6)
=sum(a6:a8, 4)

10. Example
Lab
Students in 3 evaluations