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Unformatted text preview: define and describe sampling.
5. To analyse the basis of sampling.
6. To describe a variety of sampling methods.
Statistical investigation is a comprehensive and requires
systematic collection of data about some group of people or
objects, describing and organizing the data, analyzing the data with
28 the help of different statistical method, summarizing the analysis
and using these results for making judgements, decisions and
predictions. The validity and accuracy of final judgement is most
crucial and depends heavily on how well the data was collected in
the first place. The quality of data will greatly affect the conditions
and hence at most importance must be given to this process and
every possible precautions should be taken to ensure accuracy
while collecting the data.
3.2 Nature of data:
It may be noted that different types of data can be collected
for different purposes. The data can be collected in connection with
time or geographical location or in connection with time and
location. The following are the three types of data:
1. Time series data.
2. Spatial data
3. Spacio-temporal data.
3.2.1 Time series data:
It is a collection of a set of numerical values, collected over
a period of time. The data might have been collected either at
regular intervals of time or irregular intervals of time.
The following is the data for the three types of expenditures
in rupees for a family for the four years 2001,2002,2003,2004.
8000 2002 3500 3000 4000 10500 2003 4000 3500 5000 12500 2004 5000 5000 6000 16000 3.2.2 Spatial Data:
If the data collected is connected with that of a place, then it
is termed as spatial data. For example, the data may be
29 1. Number of runs scored by a batsman in different test
matches in a test series at different places
2. District wise rainfall in Tamilnadu
3. Prices of silver in four metropolitan cities
The population of the southern states of India in 1991.
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This note was uploaded on 01/18/2014 for the course BUS 100 taught by Professor Moshiri during the Winter '08 term at UC Riverside.
- Winter '08