Sampling: estimating the frequency of behavior and beliefs
15 important questions on Sampling: estimating the frequency of behavior and beliefs
How do we call the kind of validity that measures how representable the sample is for the population and how representable the studysetting in general is for the population.
How do we call a study where the whole population is studied?
What is the key characteristic of a biased sample?
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How do we call getting a sample by sampling people who volunteered? where is this found most?
How do we call the category of sampling techniques where every individual of the population has the same chance of being selected?
How do we call a way of probability sampling where every person in the population is a number and you let a machine choose a set of numbers.
What is the difference between cluster sampling and multistage sampling?
- cluster sampling; people in a population are divided in arbitrary groups. a few groups are randomly selected, all the people in these groups are in the sample.
- multistage sampling; people in a population are divided into arbitrary groups, a few groups are randomly selected, from these groups a few people are randomly selected, these people will be in the sample.
What is the difference between clusters and strata?
How do we call a way of probability sampling where the researcher intentionally selects particular demographic categories and then randomly selects people from those categories?
How do we call a variation of stratified random sampling in which the researcher intentionally overrepresents one or more groups?
How do we call the method of dividing people from the sample into research groups in a way that both groups are equal to each other and every person in the sample has the same chance to be selected for a group?
How is the non probability sampling technique called where researchers select a small amount of people and ask each of them to recommend participating to some people in their social circle?
How do we call the non probability sampling technique where people are selected using a fixed scheme for certain groups, like 80 people from each ethnic group, or 60 people from each religion.
What is the difference between quota sampling and stratified sampling?
When might researchers use a non probability sampling?
- when the characteristic that makes the sample bias is not relevant for the survey
- when the priority to use a random sample is low, like causal and correlation claims.
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