Podcast
Questions and Answers
What type of sampling is used when every tenth car is randomly selected off the assembly line?
What type of sampling is used when every tenth car is randomly selected off the assembly line?
- Systematic (correct)
- Stratified
- Judgement
- Convenience
What is stratified sampling?
What is stratified sampling?
Dividing the class into groups and taking a random sample from each group.
What type of sampling is used when a student organization camps out in front of the Class of 1950 Lecture Hall to get signatures?
What type of sampling is used when a student organization camps out in front of the Class of 1950 Lecture Hall to get signatures?
- Convenience (correct)
- Cluster
- Stratified
- Systematic
What type of sampling is described when a city is divided into districts and then random samples of households are chosen?
What type of sampling is described when a city is divided into districts and then random samples of households are chosen?
What sampling method is used when a TV researcher stops a random cross-section of people in the street?
What sampling method is used when a TV researcher stops a random cross-section of people in the street?
What does convenience sampling involve?
What does convenience sampling involve?
Which sampling method involves selecting an item from each color after sorting clothes?
Which sampling method involves selecting an item from each color after sorting clothes?
When checking every 5th student for a university card, what type of sampling is being used?
When checking every 5th student for a university card, what type of sampling is being used?
Describe judgement sampling.
Describe judgement sampling.
What type of sampling is demonstrated when surveying one classroom to see how many people wear jeans compared to sweatpants?
What type of sampling is demonstrated when surveying one classroom to see how many people wear jeans compared to sweatpants?
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Study Notes
Types of Sampling
- Systematic Sampling: Selects every nth individual from a list or sequence. Example: Every tenth car is inspected on an assembly line for defects.
- Stratified Sampling: Divides a population into distinct subgroups (strata) and samples from each subgroup. Example: Randomly selecting two students from freshman, sophomore, junior, and senior groups in a class.
- Judgement Sampling: Relies on the researcher’s judgement to select subjects who are thought to be representative. Example: A researcher asking frequent customers at a shopping mall for their opinions.
- Convenience Sampling: Involves selecting individuals who are easiest to reach. Example: Gathering signatures outside a popular lecture hall as it's simple and accessible.
- Cluster Sampling: Divides the population into clusters, randomly selects some clusters, and samples all individuals within those clusters. Example: Omaha’s households are divided by districts, with random selection of districts and then households within them.
- Judgement Sampling (Repeat): Used when quick opinions are desired, with the researcher choosing individuals based on their perceived representativeness. Example: A TV researcher stops people on the street who seem to represent a cross-section of the population to gather opinions on a political announcement.
- Stratified Sampling (Repeat): Can also apply to personal scenarios, such as sorting clothes by color and randomly selecting items from each color for making outfits.
- Convenience Sampling (Repeat): Utilized for quick surveys, such as observing clothing trends by surveying just one classroom to compare numbers of jeans versus sweatpants.
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