Systematic Sampling

Systematic Sampling (A Probability Sampling)

1. SYSTEMATIC SAMPLING FERSIE ANN M. MALACAS MARINDUQUE NATIONAL HIGH SCHOOL

2. Systematic sampling is a technique of sampling in which every nth name in a list may be selected to be included in a sample. This is used when the subjects or respondents in the study are arrayed or arranged in some systematic or logical manner such as alphabetical arrangement, residential or house arrays, geographical placement from north to south. SYSTEMATIC

3. The procedure involved in systematic random sampling is very easy and can be done manually. The results are representative of the population unless certain characteristics of the population are repeated for every n'th individual, which is highly unlikely . SYSTEMATIC

4. The process of obtaining the systematic sample is much like an arithmetic progression. Starting number: The researcher selects an integer that must be less than the total number of individuals in the population. This integer will correspond to the first subject. SYSTEMATIC

5. Interval: The researcher picks another integer which will serve as the constant difference between any two consecutive numbers in the progression. The integer is typically selected so that the researcher obtains the correct sample size SYSTEMATIC

6. The researcher has a population total of 100 individuals and need 12 subjects. He first picks his starting number, 5. Then the researcher picks his interval, 8 . The members of his sample will be individuals 5, 13, 21, 29, 37, 45, 53, 61, 69, 77, 85, 93. EXAMPLES

7. Lucas's boss wants to send his employees to a weeklong training session that is out of town. Due to limited funding, Lucas's boss, Alex, cannot send all of his employees; he must choose a group to go to the training. Alex owns 12 movie theaters and employs 200 people. He has 12 managers out of the 200 employees . EXAMPLES

8. If the population of study contained 2,000 students at a high school and the researcher wanted a sample of 100 students, the students would be put into list form and then every 20th student would be selected for inclusion in the sample. To ensure against any possible human bias in this method, the researcher should select the first individual at random . EXAMPLES