Page 62 - Exhibit No. 3 Copies of Instructional Materials Actually Used

Main Advantages of the Random/Probability Samples

• As they represent the total sampling population, the inferences drawn
from such samples can be generalized to the total sampling
population.
• Some statistical tests based upon the theory of probability can be
applied only to data collected from random samples. Some of these
tests are important for establishing conclusive correlations.

Steps in Selecting a Simple Random Sample

• Define the target population.
• Identify an existing sampling frame of the target population or
develop a new one.
• Assign a unique number to each element in the frame.
• Determine the sampling size.
• Randomly select the targeted number of population elements

Techniques in Drawing Random Samples (Daniel, 2012)

1. Lottery method (also known as fishbowl technique).
The numbers representing each element in the target
population are placed on chips, cards, rolled paper, etc. These
are then placed in a container and thoroughly mixed. Next,
blindly select chips from the container until the desired sample
size has been obtained.

2. Table of random numbers
The numbers in a table of random numbers are not
arranged in any particular pattern. In using this technique, the
researcher should blindly select a starting point and then
systematically proceed in the table. The number of digits that are
used should correspond to the total size of the target population.
Since this process is tedious and time consuming, statistical
software may be used for large populations.

3. Randomly generated numbers using a computer program (1.e,
random number generator).
Activate the computer program with random number
generator. Key in a specific range of numbers from hundreds,
thousands, or millions and the random numbers will appear...
from which you will pick your choices.

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Nursing Research I