Any investigation or inquiry has to pass through the following stages:
1. Planning of Investigation:
The first stage of any statistical inquiry is pre-planned nature, purpose and scope.
2. Sources of Information:
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To make an inquiry successful, it is essential determine the source of data. Source of data may be internal or external; primal secondary.
3. Type of Inquiry:
Type of inquiry to be conducted includes the object and of such an inquiry. It is sometimes experimental, pilot or comprehensive inquiry; confidential or open inquiry; direct or indirect inquiry; extensive or limited inquire census or sample inquiry and regular or adhoc.
4. Editing of Data:
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After collecting the data, editing makes it comparable meaningful. Data should be properly classified in the form of schedules and tables
5. Units of Data Collection:
It means unit of data should be uniform through the study. Otherwise, it will provide misleading conclusions.
6. Degree of Accuracy:
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Degree of accuracy must be kept in mind.
7. Analysis of Data:
Data should be analyzed, prepared by using various statistical measures like averages and dispersion.
8. Interpretation of Data:
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After analyzing the data properly, it must interpret to suggest meaningful and impartial conclusions.