Information Exploration & Analysis

Abdullah Al Mahmud

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Topics

Data
Variable Types
Frequency Distribution
Histogram
Pie Chart
Bar Chart/Diagram
Line Graph

Activities

Data Collection
Table & Charts
Interpretation

Data Collection

Group -1: Favorite Color

Group -2: Blood Group

Group -3: Favorite Sports

Group -4: Duration of Stay in Hospital

Group -5: Mobile Use Time during Vacation (in minutes)

Discussion

Variable Types

Qualitative (Non-numerical)
Quantitative (Numerical)
Discrete
Continuous

Discrete vs Continuous

Discrete

Isolated, specific values

Natural number, no. of accidents

Continuous

Can take any values between any other values

Real number, Height, weight

Examples

Gender
Religion
Temperature
Income group (Lower class, Low, Middle, High)
Income
Distance of stars
Radius of screws
Diameter of trees
Room no.

More Examples

Income of a regular employee
Income of a freelancer
Any unchanging number, e.g, \(\pi\)
Result of a die throw
Father’s name
Mark of a subject
GPA of a student

Frequency Distribution

Three things required

Range \(R=X_H-X_L+1\)
Class Interval (CI)
No. of class = \(\frac{R}{CI}\)
CI=?

Table Example

Class Interval	Tally	Frequency
16-20	\|\|\|	3
21-25	\|\|\|\|	4

Charts

Pie Chart
Bar Diagram
Line-graph
Histogram (from Frequency Distribution)

Pie Chart

When Used?

Small no. of categories
Each category is part of a whole

Problems

Pie/Bar Chart

Grade	Frequency	Angle	Percentage
A+	5	\(\frac{5}{34} \times360\)	\(\frac{5}{34} \times100\)
A	7
A-	6
B	10
C	4
D	2
Total	34

Make a Frequency Distribution

47 85 31 45 36 75 77 58 30 68 52 56 49 79 54

86 37 76 64 39 55 50 72 53 51 60 35 69 78 90

Make a Histogram

Table 01:

Marks	0-20	20-30	30-40	40-50	50-60	60-70	70-80	80-100
Frequency	3	5	7	15	12	7	4	2

Table 2:

Marks	1-5	6-10	11-15	16-20	21-25	26-30
Frequency	2	5	10	9	4	3

Assignment Format

An Assignment on –

Submitted by: Cadet X

Cadet No.:

Class:

Form:

Submitted to: Mr./Mrs. X, Designation

Date of Submission:

Sylhet Cadet College