NAHQ CPHQ Practice Exam

Which technique is used to select every nth element from a population?

1. convenience sampling

2. systematic sampling

3. stratified sampling

4. simple random sampling

The correct answer is: systematic sampling

Systematic sampling is the technique used to select every nth element from a population. This method involves selecting a random starting point and then picking every nth element from the population to form a sample. It is a structured and systematic approach that helps ensure a representative sample without bias. Convenience sampling (option A) involves choosing individuals who are easiest to reach. This method can introduce bias and may not represent the entire population accurately. Stratified sampling (option C) involves dividing the population into subgroups based on certain characteristics and then selecting samples from each subgroup. This technique is useful when different subgroups have varying characteristics that need to be represented in the sample. Simple random sampling (option D) is a method where every member of the population has an equal chance of being selected. It is another common sampling technique used to ensure representativeness in the sample.