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Unformatted text preview: ed three by three to give the numbers from
001 to 100.
[See Appendix for the random number table]
Procedure to select a sample using random number table:
Units of the population from which a sample is required are
assigned with equal number of digits. When the size of the
population is less than thousand, three digit number 000,001,002,
… 999 are assigned. We may start at any place and may go on in
..
any direction such as column wise or row wise in a random
number table. But consecutive numbers are to be used.
On the basis of the size of the population and the random
number table available with us, we proceed according to our
17 convenience. If any random number is greater than the population
size N, then N can be subtracted from the random number drawn.
This can be repeatedly until the number is less than N or equal to
N.
Example 1:
In an area there are 500 families.Using the following extract
from a table of random numbers select a sample of 15 families to
find out the standard of living of those families in that area.
4652
9031
2030
0641 3819
7617
2327
1489 8431
1220
7353
0828 2150
4129
6007
0385 2352
7148
9410
8488 2472
1943
9179
0422 0043
4890
2722
7209 3488
1749
8445
4950 Solution:
In the above random number table we can start from any
row or column and read three digit numbers continuously rowwise
or column wise.
Now we start from the third row, the numbers are:
203 023 277 353 600 794 109 272 284 450 641 148 908 179 280 Since some numbers are greater than 500, we subtract 500 from
those numbers and we rewrite the selected numbers as follows:
203 023 277 353 100 294 109 272 284 450 141 148 408 179 280 c) Random number selections using calculators or
computers:
Random number can be generated through scientific
calculator or computers. For each press of the key get a new
random numbers. The ways of selection of sample is similar to that
of using random number table.
18 Merits of using random numbers:
Merits:
1. Personal bias is eliminated as a selection depends s...
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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
 Moshiri
 Business

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