Statistical investigation is the discovery of knowledge through statistical methods. It involves several stages: planning the investigation, collecting data, preparing questionnaires, editing and classifying data, analyzing and interpreting the results. Key points to consider in planning include the objective and scope of the study, information sources, type of investigation, and determining the appropriate statistical unit. Types of investigation include census or sample, direct or indirect, confidential or open, initial or repetitive surveys.

1. PLANNING OF STATISTICALPLANNING OF STATISTICAL
INVESTIGATIONINVESTIGATION

2. MEANING OF STATISTICALMEANING OF STATISTICAL
INVESTIGATIONINVESTIGATION
Investigation means to find out or discover
knowledge.
Statistical investigationStatistical investigation is that discovery ofis that discovery of
knowledge which is done throughknowledge which is done through
statistical method.statistical method.
2

3. STAGES OF STATISTICALSTAGES OF STATISTICAL
INVESTIGATIONINVESTIGATION
i. PLANNING OF INVESTIGATION
ii. COLLECTION OF DATA
iii. PREPARATION OF QUESTIONNAIRE
iv. EDITING OF DATA
v. CLASSIFICATION & TABULATION OF DATA
vi. ANALYSIS
vii. INTERPRETATION
3

4. POINTS TO BE KEPT IN MINDPOINTS TO BE KEPT IN MIND
i. OBJECT & SCOPE OF THE STUDY
ii. SOURCE OF INFORMATION
iii. TYPE OF INVESTIGATION
iv. DETERMINATION OF STATISTICAL
UNIT
4

5. KINDS OF UNITS
1. UNITS OF COLLECTION &
ENUMERATION
a) Simple
b) Composite
2. UNIT OF ANALYSIS &
INTERPRETATION
a) Rate
5

6. TYPE OF INVESTIGATION
1. CENSUS OR SAMPLE
2. DIRECT OR INDIRECT
3. CONFIDENTIAL OR OPEN
4. INITIAL OR REPITITIVE
5. REGULAR OR AD-HOC
6. POSTAL OR PERSONAL
7. OFFICIAL, SEMI-OFFICIALOR
6

7. TYPE OF INVESTIGATION
1. CENSUS OR SAMPLE
2. DIRECT OR INDIRECT
3. CONFIDENTIAL OR OPEN
4. INITIAL OR REPITITIVE
5. REGULAR OR AD-HOC
6. POSTAL OR PERSONAL
7. OFFICIAL, SEMI-OFFICIALOR
6