Post on 24-May-2015
description
DETERMINING THE SAMPLE
SIZERICHARD Z. ZONIO
Student
It is the small group you observe and a population is the larger group about which your generalization is made
Sample
It is the group to which a researcher would like the results to be generalizable
Population
N
Slovin’S formula in finding the sample size of the population
________
n=
1+Ne2
n = a sample size
Where:
N = population size e = desired margin of error
(% allowance for non-precision because of the use of sample instead of the population
For instance, in your research, if the population is 9,000 and the margin of error you allow is 2%, what is your representative sample?
Through computation, your obtained sample size will be 1,957. This is attained through the following computation:
9000
Example:
______________
n=
1+9000 (0.02)2
9000
______________
n=
1+9000 (0.0004)
9000__________
n=
1+ 3.6
9000__________
n=
4.6
n = 1,957
Always remember that the assumption of a normal distribution of the population should be considered. When the normal approximation of your population is small or poor, this sample size formula does not apply.
SAMPLE STUDY
DETERMINANTS OF YTHE PERFORMANCE OF GRADE SIX PUPILS
IN THE NATIONAL ACHIEVEMENT TEST
Stratified Random Sampling
Amityville ES = 137
______
2084 x 336 = 22
Kasiglahan Vill. ES = 946
______
2084 x 336 = 152
Macabud ES = 72
______
2084 x 336 = 12
Macaingalan ES = 22
______
2084 x 336 = 4
Mascap ES =
63 ______
2084 x 336 = 10
Puray ES = 29
______
2084 x 336 = 5
Rod. Heights ES = 283
______
2084 x 336 = 46
San Isidro ES = 294
______
2084 x 336 = 47
Tagumpay ES = 238
______
2084 x 336 = 38
THANK YOU