Identify the sampling technique used in each study. Explain your reasoning. A jo
ID: 3208009 • Letter: I
Question
Identify the sampling technique used in each study. Explain your reasoning. A journalist goes to a campground to ask people how they feel about air pollution. For quality assurance, every tenth machine part is selected from an assembly line and measured for accuracy. A study on attitudes about smoking is conducted at a college. The students are divided by class (freshman, sophomore, junior, and senior). Then a random sample is selected from each class and interviewed. Which sampling technique used in Exercise 7 could lead to a biased study? Explain your reasoning.Explanation / Answer
Based on below definition a is Purposive b is Systematic and c is Stratified sampling.
Purposive sampling, also known as judgmental, selective or subjectivesampling, is a type of non-probabilitysampling technique.
Systematic sampling is a type of probability sampling method in which sample members from a larger population are selected according to a random starting point and a fixed periodic interval. This interval, called the sampling interval, is calculated by dividing the population size by the desired sample size.
Stratified sampling refers to a type of sampling method . With stratified sampling, the researcher divides the population into separate groups, called strata. Then, a probability sample (often a simple random sample ) is drawn from each group. Stratified sampling has several advantages over simple random sampling.
Based on this definition a is Purposive, b is Systematic and c is Stratified sampling