Statistics in simple way

Statistics is the process of data collection about organizing and presentation in a good manner.

Types of statistics

1. Descriptive Statistics
2. Inferential Statistics

Descriptive Statistics

Deals with data collection or organizing and presentation in a good manner.

Inferential Statistics

Deals with prediction about future position after seeing sample.

Frequency:

Frequency means number of occurrence or times.

Example:

Salary	frequency	cumulative frequency
5000	3	3
10000	4	7
15000	2	9
20000	5	14
24000	10	24
Total frequency:	24

Data

• Data
  • Qualitative Data
  • Quantitative data
    • Continuous data
    • discrete data

Qualitative Data:

qualitative data is the data which can not be quantify by numubers.

for example: Good, bad, smart, beautiful

Quantitative data:

Quantitative data which can be quantify by numbers.

Example: Age, Salary, height, weight

Continuous data:

which is not fix. such as: feet , weight

Discrete data:

which is fix and accurate such as: salary

Data Series:

1. Individual series
2. discrete series
3. Group series

Suppose there are eight students in one class student A got 70%, student B got 78%, student c 85%, student d 90%, student e 60%, student f 60%, student g 70%, student h 85%

requirement: make individual, discrete and group series separately from data.

Individual Series:

students	percentage
a	70
b	78
c	85
d	90
e	60
f	60
g	70
h	85

Discrete series

s.no	Percentage	frequency	cumulative frequency
1	70%	2	2
2	78%	1	3
3	85%	2	5
4	90%	1	6
5	60%	2	8
TOTAL FREQUENCIES=8

Group series

Groups by percentage	frequencies
60% to 70%	4
71% to 80%	1
81% to 90%	3
Total frequencies	8